12

Number
$12$ (twelve) is:


 * $2^2 \times 3$


 * Divisible by both the sum and product of its digits:
 * $12 = \left({1 + 2}\right) \times 4 = \left({1 \times 2}\right) \times 6$

Also see

 * 12 Pentominoes
 * Product of Proper Divisors of 12