Fait général: 21090 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21090 is an uninteresting number.
Culture générale: 21090 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: September 27th is the day in 1605 that the armies of Sweden are defeated by the Polish–Lithuanian Commonwealth in the Battle of Kircholm.