No, 21 is not prime.
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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.
23 & 29
A twin prime is a prime number that differs from another prime number by two.ex. (5, 7)The numbers two away from 23 are 21 and 25 which are both composite numbers.So in short, no 23 is not a twin prime.
31 and 23 are prime numbers.
23 is a prime number.
23 and 27 are prime numbers whereas 36 and 39 are composite numbers.