what is a prime number between 21 and 29
Prime Numbers between 1 and 100 are:
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 ...
Between 21 and 29 is the prime number 23
Big mystery, eh: It is: 23!!!!!!!!!!!