2 AND 21 there is only one factor that adds up to 23 and if you multiple 21 times 2 =42
21
364
The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
25
Factors are numbers you can multiply together to get another number. Therefore, all the factors of 21 are as follows: 1,3,7,21.
-25
41
Factors are numbers you can multiply together to get another number. 21: (1, 21) (3, 7)
48, because it adds another 2 to the prime factorization.
-21 and -1
It is when the prime factors of whole number are multiplied together that they equal that number. For example the prime factors of 21 are 3 and 7 so 3*7 = 21