We're not sure what you mean by the lmm. Generally, people ask for the LCM (least common multiple) but to find that, you need at least two numbers to compare. The prime factorization of 42 is 2 x 3 x 7.
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21 isn't prime. The prime factorization of 42 is 2 x 3 x 7.
The prime factors of 42 are 2, 3 and 7.
The prime factorisation of 42 is 2*3*7.
The prime factorization of 42 is 2 x 3 x 7.2 x 3 x 7 = 422 x 3 x 7 = 42
The prime factorization of 42 does not use exponents: 2 x 3 x 7