Fatto generale: 12869 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 12869 is an unremarkable number.
Trivia: 12869 is a boring number.
Data storica: March 26th is the day in 1991 that Argentina, Brazil, Uruguay and Paraguay sign the Treaty of Asunción, establishing Mercosur, the South Common Market.