Fait général: 4220 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 4220 is a number n for which the sum of the first n composite numbers is a palindrome.
Culture générale: 4220 is an unremarkable number.
Date historique: July 21st is the day in 1925 that Sir Malcolm Campbell becomes the first man to break the 150 mph (241 km/h) land barrier at Pendine Sands in Wales.