The factors of the number 21 are:

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1,3,7 and 21

1,2,5 and 11

3,7,11 and 13

23 and 29

answer is A.

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Detailed Solution

Concept- By expressing the provided number's prime factorization, we can write the factors of the given number. By multiplying the prime factors by one another, create every conceivable factor. A number is written in multiples of its factors when it has all prime factors. This is known as prime factorization.
The provided number, 21 needs to be divided into all available factors.
Because of this, we must list all integers that divide 21 exactly.
For the given integer, we write its prime factors.
21 can be factored into two other numbers (i.e. the prime number): 3, and 7. This means that its factors are these prime integers.
Additionally, every number has 1 as a component.
Every number is a factor of itself, as demonstrated by the fact that 1 is a factor of 21. In a similar way, we know that 21 is a factor of 21. The result is: 21 has elements 1, 3, 7, and 21.
1, 3, 7 and 21 make up the factors of 21.
Hence, option 1 is correct.

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