Fatto generale: 4221 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4221 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 4221 is a boring number.
Data storica: July 22nd is the day in 1793 that Alexander Mackenzie reaches the Pacific Ocean becoming the first Euro-American to complete a transcontinental crossing of Canada.