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โˆ™ 2012-07-09 20:18:49
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Q: Which number is a factor of 21 and also a prime number?
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Is 21 a factor of a prime number?

No. The only factors of a prime number are 1 and itself. The only way that 21 could be a factor of a prime number is if it were a prime number, but it is not because 21 is also divisible by 3 and 7.


Which number is a factor of 21 an also a prime number?

They are: 3 and 7


What is a prime number for 12 and 21?

3 is a prime factor of 12 and of 21.


What number is it has 90 as a factor thre number is prime 21 is the multiple of the number?

If 21 is a multiple of the number, the number cannot have 90 as a factor.


What prime number is a factor of 12 and 21?

3


What prime number is a factor of 21?

3 and 7


What is the composite number between 20 and 50 whose prime factor is 21?

21 is not a prime factor, it is 3 x 7


What number is a factor of 21 and a prime number?

21 = 3 x 7 both 3 and 7 are prime numbers


What number is a factor of 70 is a prime number and 21 is a multiple?

7


What are the prime factors of 21?

prime factor = prime number which can be divided into the given number with no remainder The prime factors of 21 are 3 and 7.


What number is a prime factor of both 12 and 21?

3


What is the factor tree of 21?

3x7=21 3 and 7 are prime numbers, so 3x7 is the factor tree of the number 21.


Write each number 21 prime factor?

3 x 7 = 21


What is a number called when it has one factor?

Like 21? Prime numbers.


What are the greatest common factor of 21 and 19?

If 1 is considered a factor, the only common factor of 21 & 19 is 1, because 19 is a prime number. I'm not sure whether 1 is considered a factor since it does not reduce the original number and it's not a prime number.


What is the greatest common factor of 8 21 and 75?

the greatest common factor of 8 21 and 75 is 1.


What factor of 21 is a prime factor?

21 = 3 x 7. Both these factors are prime.


Are 4 and 21 relatively prime?

Yes, 4 and 21 are relatively prime. Numbers that are relatively prime only have the number 1 as a common factor. That is the case with 4 and 21.


What is a product of its prime factor?

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


Is 21 a prime factor?

no


What are the factor and prime number of 63?

1, 3, 7, 9, 21, 63 3 and 7 are prime.


Is number 21 prime or composite?

number 21 is prime


What is the prime factor tree of 21?

21 3,7


Is the prime number 21 is a prime number?

21 is a composite number, not a prime, having prime factors 3x7.


What is the composite number between 20 and 50 whose prime factor have a sum of 21?

38 2-19= 21