four factors: 1, 3, 7, 21
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 21 are: 1, 3, 7, and 21.The prime factors of 21 are: 3 and 7.
The factors of 21 are: 1, 3, 7, 21 The factors of 23 are: 1, 23
The factors of 21 are: 1, 3, 7, 21 The factors of 51 are: 1, 3, 17, 51
If 21 is a factor of a number, then the factors of 21 must also be factors. So 3 and 7
Factors of 21 = 1, 3, 7, 21 Multiples of 21: 21, 42, 63, 84, 105, 126, 147 +21 . . .
The factors of 21 are :1,3,7,21
4 factors they are 1,3,7 and 21
Four factors.
They are: 1 3 7 and 21
21 has two prime factors.
The number 21 has only four factors: 1, 3, 7, and 21. Many number have more than four factors. Among them are 1x2x3x4x5 = 120.
The factors of 21 are: 1,3,7, and 21.
The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70.
The factors of 21 are 1, 3, 7, and 21
The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70 The common factors of 21 and 70 are 1 and 7.
It has only four factors and they are: 1, 3, 7 and 21
The factors of 21 are: 1 3 7 21 The prime factors are: 3 and 7