Fatto generale: 87521 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 87521 is an uninteresting number.
Trivia: 87521 is an uninteresting number.
Data storica: August 16th is the day in 1819 that Seventeen people die and over 600 are injured in cavalry charges at a public meeting at St. Peter's Field, Manchester, England.