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21 has two prime factors.

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Q: How many prime numbers are there in 21?
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How many two digit prime numbers are there?

There are 21 two-digit prime numbers.


How many prime numbers are between 10 and 21?

Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.


How many prime numbers between 1 and 8888888888888888888888888888888888888888888888?

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How many prime numbers are between 101 and 200?

If you include '101', there are 21 of them.


Is 21and 23 twin prime numbers?

No, 21 and 23 are not twin prime numbers. Twin primes are pairs of prime numbers that differ by 2, such as 3 and 5, or 11 and 13.