Fatto generale: 2169 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2169 is a boring number.
Trivia: 2169 is a boring number.
Data storica: December 8th is the day in 1972 that United Airlines Flight 553 crashes after aborting its landing attempt at Chicago Midway International Airport, killing 45.