Fait général: 21056 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21056 is a boring number.
Culture générale: 21056 is an uninteresting number.
Date historique: August 24th is the day in 1682 that William Penn receives the area that is now the state of Delaware, and adds it to his colony of Pennsylvania.