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Q: What are the divisors of the number 21?

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There are 8 divisors of 105 (viz: 1, 3, 5, 7, 15, 21, 35, 105)

First, you want to know the definition of a perfect number: A perfect number is an integer which is equal to the sum of all its positive integer divisors that are less than itself. Example: The positive integer divisors of 6, less than 6, are 1, 2, and 3. The sum of those divisors is 1 + 2 + 3 = 6. Therefore, 6 is a perfect number. Now, 21 does not meet this definition and therefore is not a perfect number. Let's try it. There are three positive divisors of 21, namely, 1, 3, and 7, that are less than 21, itself. (There are no others.) But the sum of these divisors is 1 + 3 + 7 = 11, which is not equal to 21. Therefore, we confirm that 21 is not a perfect number.

It is a number for which the sum of the proper divisors is less the the number. Example: 21 has divisors 1, 3, and 7. The sum is 11 which is less than 21. Note: All prime numbers are deficient and as there are an infinite number of them, there are an infinite set of deficient numbers too.

1,3,7, and 21

1, 2, 3, 6, 7, 14, 21, 42.

There are eight divisors of the number 195.

They are 1, 3, 7, 21.

The divisors of 147 are 1, 3, 7, 21, 49, 147.

23 is a prime number. It has two divisors.

The first number to have exactly 10 divisors is 48.

A perfect number equals the sum of its proper divisors. A deficient number is greater than the sum of its proper divisors. An abundant number is less than the sum of its proper divisors. Proper divisors of a number do not include the number itself.

The divisors of 735 are 1, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245, and 735.

2,4,8 (1 and 16 are divisors too, but the number and 1 are always divisors)

Yes, factors are divisors.

231 has 8 divisors.

The number 3,240 has 40 divisors.

The number you are seeking is 36. The divisors are - 36,1,18,2,12,3,9,4,6.

It is deficient: It's only proper divisors are 1, 3, and 7, which sums to 11, which is less than 21.

293 only has two divisors because it is a prime number. The divisors are 1 and 293.

The divisors of 42 are 1, 2, 3, 6, 7, 14, 21, 42.

Any prime number to the 99th power has one hundred divisors.

7,200 has 54 different divisors.

29 is a prime number and so its only divisors are 1 and 29.

Because five is a prime number its only divisors are 1 and itself.

Since 11 is a prime number, its only divisors are 1 and itself.