21. Sonni tub ko'paytuvchilarga ajrating: 36

To factorize 36 into its prime factors:

1. Start dividing by the smallest prime number, 2.
2. 36 ÷ 2 = 18
3. 18 ÷ 2 = 9
4. 9 is not divisible by 2, so try the next prime number, 3.
5. 9 ÷ 3 = 3
6. 3 ÷ 3 = 1

Thus, the prime factorization of 36 is 2 × 2 × 3 × 3.

Ответ: 2×2×3×3