2 x 2 x 2 x 2 x 3 x 5 = 240
That is correct, the prime factorization of 240 is 24 x 3 x 5
240
240 = 24 x 31 x 51
2 is the only exponential number in the prime factorization of 240 (2 x 2 x 2 x 2 x 3 x 5 or 24 x 3 x 5).
The prime number is the prime factorization. For example, the prime factorization of the prime number 3 is 3. Get it?
240 120,2 60,2,2 30,2,2,2 15,2,2,2,2 5,3,2,2,2,2
53 is a prime number so there is no relevant prime factorization for it.
240 = 24 x 31 x 51
24 x 3 x 5 = 240
The only number with that prime factorization has to be 48.
421 is a prime number so it does not have prime factorization.
When all the factors are prime numbers, that's a prime factorization.