Fait mathématique: 2851 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 2851 is an uninteresting number.
Date historique: October 21st is the day in 1520 that João Álvares Fagundes discovers the islands of Saint-Pierre and Miquelon, bestowing them their original name of "Islands of the 11,000 Virgins".