Fatto generale: 10553 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 10553 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 10553 is an uninteresting number.
Data storica: November 21st is the day in 1979 that the United States Embassy in Islamabad, Pakistan is attacked by a mob and set on fire, killing four.