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67 is a Prime number, but 21 isn't.

A prime number can only be evenly divided by '1' and itself.

21 can be evenly divided by 1, 3, 7, and 21.

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Q: Is 21 and 67 a pair of prime numbers?
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What are the factors and prime factors of 67?

67 is a prime number. The only two factors of a prime number are 1 and itself.The two factors of 67 are 1 and 67. There are only two factors of a prime number.The only factor pair of 67 is 1 x 67. There is only one factor pair of a prime number.The proper factors of 67 are only 1 or,if the definition you are using excludes 1, there are none.The only prime factor of 67 is 67. There is only one prime factor of a prime number - itself.The distinct prime factor (listing each prime factor only once) of 67 is also 67.The prime factorization of 67 is 67. In some cases, to emphasize that it is prime, you might write the prime factorization as 1 x 67.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.