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Q: What are the proper factors of the number 21?

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The proper factors of a number are all the factors less than itself, so the proper factors of 126 are 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, and 63. In some cases, the number 1 is excluded from the list of proper factors, too.

No, 294 is not a proper factor of 147. Proper factors are smaller than the number of which they are a factor. The proper factors of 147 are 3, 7, 21, 49, and perhaps 1, depending on the definition you are using.

The proper factor of 21 is 1, 3 and 7

The proper factors of a number do not include one and the number itself.

The number one has no proper factors.

"Proper factors" are all of a number's factors except one and the number itself.

The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42.The proper factors are 1, 2, 3, 6, 7, 14, and 21or 2, 3, 6, 7, 14, and 21 if the number 1 is excluded as it is in some definitions of proper factor.

The factors of a number include 1 and the number itself. The proper factors do not.

Proper factors are factors of the number except the number itself. So, with that said, the proper factors of 38 are 1, 2, and 19.

The proper factors are the regular factors without one and the number itself.

Proper factors don't include one and the number itself.

Proper factors don't include one and the number itself.

The proper factors of 64 are 2, 4, 8, 16 and 32. For proper factors of a number exclude 1 and the number itself from the list of factors.

No, no prime number has proper factors.

One has no proper factors.

1, 3, 7 and 21

A perfect number is the term for a number that is equal to the sum of its proper divisors. Be careful not to confuse that with proper factors. Proper divisors include 1 but not the number itself. Proper factors don't include either I or the original number.

The set of factors includes one and the number itself. Proper factors do not include those two.

Proper factors of a number do not include 1 or the number itself. For example, all of the factors of 6 are 1, 2, 3, and 6, but the proper factors of 6 are 2 and 3.

Depending on your definition of proper factors, the set of proper factor factors either doesn't include 1 and/or the number itself for a given number.

That is a list of the proper divisors of 588. Most definitions of proper factors do not include the number 1.

Perfect number (and it's proper divisors not proper factors)

The set of proper factors doesn't include 1 and the number itself.

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

Proper factors do not include one and the number itself.