Fait général: 21067 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21067 is an unremarkable number.
Culture générale: 21067 is an uninteresting number.
Date historique: September 4th is the day in 1888 that George Eastman registers the trademark Kodak and receives a patent for his camera that uses roll film.