Fatto generale: 54217 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 54217 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 54217 is a boring number.
Data storica: June 9th is the day in 1928 that Charles Kingsford Smith completes the first trans-Pacific flight in a Fokker Trimotor monoplane, the Southern Cross.