21 (number)
= 21 (number)
{wiki=21_(number)}
The number 21 is an integer that comes after 20 and before 22. It is an odd number and can be expressed as the sum of two prime numbers, 10 + 11, or as a product of the prime number 3 and 7 (3 × 7).
= 21 (number)
{wiki=21_(number)}
The number 21 is an integer that comes after 20 and before 22. It is an odd number and can be expressed as the sum of two prime numbers, 10 + 11, or as a product of the prime number 3 and 7 (3 × 7).