Fatto matematico: 2135 is a value of n for which s(n-1) + s(n+1) = s(2n).
Trivia: 2135 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: 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.