Fait mathématique: 21887 is an unremarkable number.
Culture générale: 21887 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: December 3rd is the day in 1992 that a test engineer for Sema Group uses a personal computer to send the world's first text message via the Vodafone network to the phone of a colleague.