Fatto generale: 21867 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21867 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21867 is an uninteresting number.
Data storica: November 13th is the day in 1982 that the Vietnam Veterans Memorial is dedicated in Washington, D.C. after a march to its site by thousands of Vietnam War veterans.