Journal rankings · indicator year 2021
Choose a field to open its ranking, or a journal to find its row in its subfield’s list.
Subfield ranking · 2021
Algebra and Number Theory journal rankings 2021
26 ranked journals · Subfield in Mathematics
Algebra and Number Theory has 26 ranked journals in 2021. The median journal has an OJR of 0.40, below the world average of 1.00, down 0.05 on 2020; Q1 starts at OJR 0.52. The top three are The Ramanujan Journal, International Journal of Number Theory, and Research in Number Theory.
Ranks and citation indicators: 2021. Journal access status and listed APC: source snapshot September 23, 2026.
Journals whose main subfield sits in this category and that published at least 30 citable documents (articles, reviews and conference papers) in 2018–2020, the window the 2021 score is computed on.
The OpenJournalRank Indicator (OJR) is a free, publicly available metric of a journal’s field-normalized citation impact, computed from open OpenAlex citation data. It compares citations to a journal’s papers from the previous three years with the world average for papers of the same subfield, year and type, so 1.00 is the world average and values can be compared across fields. It is computed with the NCI3 method.
The middle OJR among ranked journals in this category: half score higher, half lower. 1.00 is the world average for papers of the same subfield, year and type.
The dot is this category, the solid tick is the median of all ranked journals and the dashed line is the world average.
Share of ranked journals in this category that are fully open access, so every paper is free to read. Hybrid journals, which sell subscriptions and open single papers for a fee, are not counted.
Median list price of the article processing charge, in US dollars, among ranked journals in this category that list a price above zero. Journals with a listed APC of $0 and journals with no known price are left out of this median. The At a glance table below gives a second median that includes the $0 prices.
Subfields of Mathematics (10)
26 ranked journals
Filters
Rank is the position by OJR within the list on screen; 1 is the highest. | OJR is field-normalized 3-year citation impact: 1.00 is the world average for papers of the same subfield, year and type, so values compare across fields. The badge is the journal’s quartile in this list. | Citations per paper over a two-year window, counted from OpenAlex. It is not field-normalized, so compare it only between journals of the same field. ▲ or ▼ is the change from 2020. This is OpenJournalRank’s own count, not Clarivate’s Journal Impact Factor. | Citable documents (articles, reviews and conference papers) published in 2018–2020, the window the 2021 OJR is computed on. A journal needs at least 30 to be ranked. | Share of the journal’s 2018–2020 papers that are free to read in any open-access form. The green OA tag next to a title marks a fully open-access journal. | List price of the article processing charge in US dollars. “$0 listed” means the listed price is zero; a dash means no price is listed. | The line is the journal’s OJR from 2012 to 2021. | Compare |
|---|---|---|---|---|---|---|---|
1The Ramanujan JournalSpringer Science+Business Media · Netherlands | 0.76Q1 | 0.64 0.05 down from 2020 | 348 | 39% | $2,990 | ||
2International Journal of Number TheoryWorld Scientific · Singapore | 0.62Q1 | 0.62 0.18 up from 2020 | 404 | 41% | — | ||
3Research in Number TheorySpringer Science+Business Media · Switzerland | 0.61Q1 | 0.51 0.09 up from 2020 | 137 | 62% | $3,590 | ||
4Acta et Commentationes Universitatis Tartuensis de MathematicaOAUniversity of Tartu Press · Estonia | 0.56Q1 | 0.82 0.08 down from 2020 | 70 | 100% | — | ||
5MathematikaWiley · United Kingdom | 0.54Q1 | 0.51 0.03 up from 2020 | 170 | 46% | $3,930 | ||
6Communications in AlgebraTaylor & Francis · United States | 0.53Q1 | 0.53 0.02 down from 2020 | 1,109 | 30% | — | ||
7Journal of Algebra and Its ApplicationsWorld Scientific · Singapore | 0.52Q1 | 0.49 0.06 up from 2020 | 843 | 30% | — | ||
8Mathematical and Computer Modelling of Dynamical SystemsOATaylor & Francis · United States | 0.47Q2 | 1.48 0.25 up from 2020 | 71 | 100% | $1,533 | ||
9Periodica Mathematica HungaricaSpringer Science+Business Media · Hungary | 0.47Q2 | 0.70 0.13 down from 2020 | 132 | 34% | $3,090 | ||
10Journal of Number TheoryElsevier BV · Belgium | 0.43Q2 | 0.45 0.06 down from 2020 | 717 | 97% | $3,550 | ||
11Acta ArithmeticaPolish Academy of Sciences · Poland | 0.43Q2 | 0.41 0.01 up from 2020 | 336 | 57% | — | ||
12Bulletin of the Australian Mathematical SocietyOACambridge University Press · United Kingdom | 0.42Q2 | 0.46 0.01 down from 2020 | 492 | 100% | $3,550 | ||
13Indian Journal of Pure and Applied MathematicsIndian National Science Academy · India | 0.41Q2 | 0.58 0.22 up from 2020 | 242 | 15% | — | ||
14Algebra ColloquiumWorld Scientific · Singapore | 0.39Q3 | 0.28 0.09 down from 2020 | 164 | 15% | — | ||
15Acta Mathematica VietnamicaSpringer Science+Business Media · Singapore | 0.39Q3 | 0.57 0.07 up from 2020 | 147 | 34% | $3,190 | ||
16International Journal of Algebra and ComputationWorld Scientific · Singapore | 0.38Q3 | 0.44 0.11 down from 2020 | 233 | 55% | — | ||
17Asian-European Journal of MathematicsWorld Scientific · Singapore | 0.37Q3 | 0.55 0.04 up from 2020 | 447 | 5% | — | ||
18Journal of Commutative AlgebraRocky Mountain Mathematics Consortium · United States | 0.37Q3 | 0.35 0.12 down from 2020 | 93 | 78% | — | ||
19Lithuanian Mathematical JournalSpringer Science+Business Media · Netherlands | 0.36Q3 | 0.58 0.10 up from 2020 | 122 | 33% | $3,290 | ||
20International Electronic Journal of AlgebraOAInternational Electronic Journal of Algebra · Türkiye | 0.36Q3 | 0.33 0.02 up from 2020 | 91 | 100% | — | ||
21Communications in MathematicsDe Gruyter Open · Czechia | 0.34Q4 | 0.57 0.43 up from 2020 | 55 | 100% | — | ||
22São Paulo Journal of Mathematical SciencesSpringer Nature · Brazil | 0.28Q4 | 0.52 0.13 up from 2020 | 113 | 34% | $3,390 | ||
23J. Integer Seq.Publisher not listed | 0.27Q4 | 0.48 0.08 up from 2020 | 85 | — | — | ||
24Czechoslovak Mathematical JournalSpringer Nature · Netherlands | 0.25Q4 | 0.27 0.03 down from 2020 | 251 | 86% | $2,890 | ||
25Hardy-Ramanujan JournalPublisher not listed | 0.20Q4 | 0.17 0.08 up from 2020 | 32 | 92% | — | ||
26Functiones et Approximatio Commentarii MathematiciAdam Mickiewicz University Press · Poland | 0.16Q4 | 0.12 0.10 down from 2020 | 95 | 61% | — |
Subfields of Mathematics, with Algebra and Number Theory highlighted.
- Applied Mathematics180
- Statistics and Probability136
- Geometry and Topology132
- Mathematical Physics65
- Modeling and Simulation36
- Algebra and Number Theory26
- Discrete Mathematics and Combinatorics15
- Numerical Analysis8
- Theoretical Computer Science2
- Computational Mathematics0
Journals
Citations made in 2021. Corpus-wide, 87.7% of core-journal articles and reviews published that year have at least one matched reference; the share varies by journal and field.
4 additional Algebra and Number Theory journals with metrics are unranked under this release’s eligibility rules: a journal needs at least 30 citable documents in 2018–2020, at least 80% of them with a subfield, and a positive world-average expectation. Ranks are within the whole category; filters hide rows without re-ranking. OJR excludes self-citations.
At a glance
Indicator year: 2021. Publication window: 2018–2020. How these summaries are calculated
- Ranked journals
- 26
- Window papers (baseline)
- 10,892 +5.1% from indicator year 2018
- Median OJR
- 0.399 -17.3% from indicator year 2018
- Rising journals (2025)
- 0
Window papers are the baseline paper population: citable papers (articles, reviews and conference papers) from 2018–2020 in all journals of the world-average baseline, including non-core journals, counted by each paper’s own subfield. They are not the papers of the ranked journals alone.
| Measure | Year series | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ranked journals | 11 | 12 | 13 | 14 | 12 | 13 | 15 | 16 | 15 | 17 | 21 | 22 | 23 | 24 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 27 | 25 | 26 | 26 | |
| Window papers (baseline) | 4,757 | 5,043 | 5,441 | 5,714 | 5,934 | 6,002 | 6,304 | 6,522 | 7,016 | 7,321 | 7,692 | 7,948 | 8,338 | 8,701 | 9,244 | 9,673 | 10,140 | 10,385 | 10,364 | 10,417 | 10,588 | 10,892 | 11,193 | 11,341 | 11,409 | 11,553 | |
| Median OJR | 0.59 | 0.518 | 0.54 | 0.573 | 0.632 | 0.553 | 0.629 | 0.60 | 0.66 | 0.58 | 0.524 | 0.62 | 0.53 | 0.521 | 0.61 | 0.574 | 0.552 | 0.51 | 0.48 | 0.42 | 0.4488 | 0.399 | 0.4494 | 0.38 | 0.397 | 0.39 |
How to read these rankings
- OJR, the OpenJournalRank Indicator
- A field-normalized 3-year citation impact, computed from OpenAlex with the NCI3 method. It divides the citations a journal’s papers received by the world average for papers of the same subfield, year and type, so 1.00 is the world average and 2.00 means twice as many citations as expected. Because it is normalized, it can be compared across fields. Read the methodology
- Quartiles
- Q1 to Q4 split the ranked journals of the list you are viewing into four equal groups by OJR. A journal’s quartile depends on the list: the same journal can be Q1 in its subfield and Q2 among all journals.
- Impact factor (2-year)
- Citations per paper over a two-year window, counted from OpenAlex. It is easy to compare with familiar impact factors but is not field-normalized, so compare it only within a field. It is not Clarivate’s Journal Impact Factor. Why it differs from the Journal Impact Factor
- Rank ranges
- Each rank in the latest year carries a likely range from 1,000 resamples of the journal’s papers. Where two journals’ ranges overlap, the data cannot tell them apart, so treat neighbouring ranks as ties.