22

Number
$22$ (twenty-two) is:


 * $2 \times 11$


 * The number of digits in its factorial:
 * $22! = 1 \, 124 \, 000 \, 727 \, 777 \, 607 \, 680 \, 000$
 * which has $22$ digits


 * $22$ is a palindromic number whose square is also palindromic:

Also see

 * Square of Small-Digit Palindromic Number is Palindromic