2.15
21. 63 = 32 x 7 84 = 22 x 3 x 7 hcf = 3 x 7 = 21
22
I can't remember his name offhand, but I remember seeing him between number 20 and number 22.
21 and 22 are consecutive composite numbers.
The prime number is 24
21.5
It is 18, the middle number when they are in order.
20 21 22 30
21 22 23 24 which is the prime number
22
26
22
It is: 22
16 21 22 29
21. 63 = 32 x 7 84 = 22 x 3 x 7 hcf = 3 x 7 = 21
44
The first composite number greater than 21 is 22.