3000/Mistake

Source Work

 * The Dictionary
 * $3000$
 * $3000$

Mistake

 * The smallest number requiring more than $12$ letters to write in the English language. It uses $13$.

Well, $101$ uses more than $12$ letters for a start:
 * one hundred and one, for $16$ letters

or, in the American style:
 * one hundred one, for $13$ letters.