Fait général: 2109 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2109 is a value of n so that n(n+7) is a palindrome.
Culture générale: 2109 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: October 9th is the day in 1701 that the Collegiate School of Connecticut (later renamed Yale University) is chartered in Old Saybrook, Connecticut.