Fait général: 21885 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21885 is an uninteresting number.
Culture générale: 21885 is a boring number.
Date historique: December 1st is the day in 1969 that the first legislation to limit aircraft noise levels at airports is introduced in U.S. Federal Air Regulation, Part 36.