Fatto generale: 50011 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 50011 is an unremarkable number.
Trivia: 50011 is an unremarkable number.
Data storica: December 3rd is the day in 1960 that the musical Camelot debuted at the Majestic Theatre on Broadway, and would become associated with the Kennedy administration.