Fait mathématique: 2135 is a value of n for which s(n-1) + s(n+1) = s(2n).
Culture générale: 2135 is a boring number.
Date historique: November 4th is the day in 1993 that a China Airlines Boeing 747 overruns Runway 13 at Hong Kong's Kai Tak International Airport while landing during a typhoon, injuring 22 people.