The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
1 and 46 3 and 49 7 and 21.
11
When the "factors" of a number are listed, the list is usually restricted to positive factors. Then there would be no answer to the question, because no group of positive numbers can add up to make zero.
21 and 5
21 and 21 equal 42.
21 and 5
5 and 16.■
21. Its factors are 1, 3, 7 and 21 which add to 32.
the two factors that equal are 155 *2 by ivelisse cruz in 6th grade 2012
The factors of 21 are 1, 3, 7, and 21. 3 - 1 = 2
If 21 is a factor of a number, then the factors of 21 must also be factors. So 3 and 7