I can't remember his name offhand, but I remember seeing him between number 20 and number 22.
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The number 21 in binary is 10101
Nothing.. Because 21 is a Prime number
21
The additive inverse of a number is the value that, when added to the original number, results in zero. In this case, the additive inverse of -21 would be 21, as -21 + 21 equals zero. The additive inverse is essentially the negative of the original number, so the additive inverse of -21 is 21.
Then the number is 21 because 3 times 21 = 63