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The factors of 21 are 1, 3, 7, and 21.
The only factor of 21 that is a composite number is 21.
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Continue Learning about Math & Arithmetic
There's a certain 10-digit number where that the first digit is equal to the number of zero is the number of 1's in the entire number where the 10th digit is the number of 9's in the number?
6210001000
What number am I. I am a two digit number You can count to me by 4's plus 3 or by 5's plus 3 What is the smallest number i can be?
23
Which number is between point S and point T on the number line?
k*S + (1-k)*T where k is any number between 0 and 1.
What is 3 less than a number s?
s-3
How many number 7's are in the number 7?
one
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