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Best Answer

'3'

3 x 4 = 12

3 x 7 = 21

NB '7' is also a Prime number.

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lenpollock

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2mo ago
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lawrence.bestman2013

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2mo ago

3 times 7 equal to 21 and 3 times 4 equal to 12 the prime factor is 7

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Wiki User

14y ago

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Q: What number is a prime factor of both 12 and 21?
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Related questions

What prime number is a factor of 12 and 27?

The prime factors of 12 are 2 and 3. The only prime factor of 27 is 3. The prime number that both 12 and 27 have as a factor is 3.


Is 12 a prime factor?

12 is a composite number, not a prime factor.


Are 12 and 51 relatively prime?

They are not relatively prime. To be relatively prime, the only common factor they could have would be the number 1. Both also have the number 3 as a common factor, so they are not relatively prime.


Is 12 the smallest distinct prime factor?

No, 12 is not a prime number.


What is composite factors?

A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.


Is the prime number and prime factor the same definition?

It depends how its used. 3 is a prime number. 3 is a prime factor of 12.


What is a prime number for 12 and 21?

3 is a prime factor of 12 and of 21.


What is the smallest positive prime number of 12?

2 is the smallest prime factor of 12.


What prime number is a factor of 12 and 21?

3


Is 12 a factor number or a multiple number?

Either or both. 12 is a factor of 24. 12 is a multiple of 6. 12 is both a factor and a multiple of itself.


What is common prime factors?

All numbers have factors. Some numbers have some of the same factors as other numbers. These are common factors. If the factor is a prime number, it is a common prime factor. 3 is a prime number. 3 is a factor of 9. 3 is a factor of 12. 3 is a common prime factor of 9 and 12.


Factor of 12 and it isn't a prime number or an even number?

1