21,480

Number
$21 \, 480$ (twenty-one thousand, four hundred and eighty) is:


 * $2^3 \times 3 \times 5 \times 179$


 * The $22$nd integer $m$ such that $m! - 1$ (its factorial minus $1$) is prime:
 * $3$, $4$, $6$, $7$, $12$, $14$, $30$, $32$, $33$, $38$, $94$, $166$, $324$, $379$, $469$, $546$, $974$, $1963$, $3507$, $3610$, $6917$, $21 \, 480$