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Q: What factors of a number equal 21?

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21. Its factors are 1, 3, 7 and 21 which add to 32.

It is when the prime factors of whole number are multiplied together that they equal that number. For example the prime factors of 21 are 3 and 7 so 3*7 = 21

If 21 is a factor of a number, then the factors of 21 must also be factors. So 3 and 7

The factors of 21 are :1,3,7,21

The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.

A composite number is a number that has more than two factors. The factors of 21 are 1, 3, 7, and 21. Therefore, 21 is a composite number.

The factors of 21 are: 1, 3, 7, 21.

The factors of 21 are: 1, 3, 7, 21.

4 factors they are 1,3,7 and 21

If a number has equal factors, it is a perfect square and the equal factors would be square roots.

3 times 7 = 21

No, it is not possible. Every multiple of 21 is a composite number. 21 is a composite number and its factors are 1, 3, 7 and 21(4 factors). Any multiple of 21 must have all the factors of 21. So, every multiple of 21 has at least 4 factors. And a prime number has only two factors so, any multiple of 21 can't be prime.

If one of the number is 3 equal factors, then it is a cube root.

21

A Square Root is one of the two equal factors of a number.

21 and 1 are factors of 84.

There cannot be any. If the number has 21 and 351 as factors then it already has 16 factors.

The factors of 21 are 1, 3, 7 and 21. For them to be common, they need to be compared to another set of factors.

21 and 5

if the factors are equal the the number must be a square so the factor is the square root.

The number 21 has only four factors: 1, 3, 7, and 21. Many number have more than four factors. Among them are 1x2x3x4x5 = 120.

The factors of 21 are 1, 3, 7 and 21. To be common, they need to be compared to another set of factors.

The number 21 in binary is 10101

Sum of even factors of a number will always equal an even number.

5 and 16.■