Fatto generale: 8542 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8542 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 8542 is an uninteresting number.
Data storica: May 21st is the day in 879 that Pope John VIII gives blessings to duke Branimir and to Croatian people, considered to be international recognition of the Croatian state.