The factor pairs of 21 are (21, 1) (7, 3)
Even considering their negative counterparts, they don't add up to -13.
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The multiples of 13 are numbers that can be divided by 13 without leaving a remainder. The multiples of 13 are: 13, 26, 39, 52, 65, 78, 91, 104, 117, and so on. The multiples of 7 are numbers that can be divided by 7 without leaving a remainder. The multiples of 7 are: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, and so on.
Multiples of 13, like 13, 26 and 39.
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Factors of 21 = 1, 3, 7, 21 Multiples of 21: 21, 42, 63, 84, 105, 126, 147 +21 . . .
The first 3 multiples of 13 are: 13, 26, and 39.