Fatto generale: 5105 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 5105 is an unremarkable number.
Trivia: 5105 is a boring number.
Data storica: December 22nd is the day in 1964 that the first test flight of the SR-71 (Blackbird) took place at Air Force Plant 42 in Palmdale, Calif.