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21 is a composite number; it has factors other than 1 and itself. It is not a Prime number.
The 4 factors of 21 are 1, 3, 7, and 21.
The factor pairs of 21 are 1 x 21 and 3 x 7.
The proper factors of 21 are 1, 3, and 7 or,
if the definition you are using excludes 1, the are 3 and 7.
The prime factors of 21 are 3 and 7.
The 2 distinct prime factors (listing each prime factor only once) are 3 and 7.
The prime factorization of 21 is 3 x 7.
NOTE: There cannot be common factors, a greatest common factor, or a least common multiple because "common" refers to factors or multiples that two or more numbers have in common.
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Prime factors of 21?
The prime factors of 21 are 3,7.
What is 21 as a product of its prime factors?
21 as a product of its prime factors is 1 X 3 X 7.
What are the factors and prime factors of 9 and 21?
1,3,9 1,3,7,21 3 and 7 are prime.
Prime factorization of 18 and 21?
The factors of 18 are: 1 2 3 6 9 18 The prime factors are: 2 x 3 x 3 and The factors of 21 are: 1 3 7 21 The prime factors are: 3 x 7
What is the prime factor of 21?
The prime factors of 21 are 3 and 7.
