Results so far. Here are the (up to) 10 largest factors (of at least 60 digits) found by ECM so far in 2021 (see also the all-times top-50 table, and the top ten from 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020):
| digits | factor | from | B1 | sigma | date | who |
| 74 | 29061871024474524652460048148671349817057591121446211165236889497476421553 | 21429+1 | 260e6 | 16049588211814812728 | 10 Feb 2021 | R. Propper |
| 74 | 25707943518696221194354398472561375355836712931411426198630128562025289803 | A(4788,12584) | 260e6 | 1:1625299226 | 31 Mar 2021 | R. Propper |
| 71 | 32823879912258735727626372991309710431020327877147706439666534226483113 | 8316+7316 | 110e6 | 1:??? | 22 Apr 2021 | J. Becker |
| 71 | 11988354452101698103039233924139287094105498100825117049000570758791159 | 3757+1 | 1.7e9 | 1:34498279 | 19 Jul 2021 | S. Wagstaff |
| 70 | 4702574864356903668328925230483249938419748952832641483390255334999479 | 5493-1 | 13e8 | 1:3612551401 | 04 Jan 2021 | S. Wagstaff |
| 70 | 2790185010398773029145576016481051849652256713736325440896142184620821 | 22682+1 | 2.4e9 | 1:1903091732 | 14 Aug 2021 | S. Wagstaff |
| 69 | 683802217606094509460359945174630997716878924606013194220815953901277 | 22822+1 | 18e8 | 1:3838493405 | 01 Mar 2021 | S. Wagstaff |
| 69 | 457309376061341968858969907539927424797564127673204762828701146483601 | 22390+1 | 16e8 | 1:195128836 | 09 Jan 2021 | S. Wagstaff |
| 69 | 194038896022637781283943529202525374330942645948410515792534794865319 | 21393-1 | 16e8 | 1:1115269384 | 25 Mar 2021 | S. Wagstaff |
| 68 | 14713427619262280164702742524136752190263346928019151705141695286113 | 22594+1 | 1e9 | 1:403774808 | 18 Sep 2021 | S. Wagstaff |
ECMNET Newsletters: number 1 (13 Feb 1998), number 2 (15 Mar 1998), number 3 (17 Apr 1998), number 4 (15 May 1998), number 5 (18 June 1998), number 6 (15 July 1998), number 7 (17 August 1998), number 8 (17 September 1998), number 9 (16 October 1998), number 10 (23 November 1998), number 11 (17 December 1998), number 12 (19 April 1999), number 13 (16 December 1999).
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