Fait général: 21057 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21057 is an unremarkable number.
Culture générale: 21057 is an unremarkable number.
Date historique: August 25th is the day in 1248 that the Dutch city of Ommen receives city rights and fortification rights from Otto III, the Archbishop of Utrecht.