How to multiply 21 by itself 2 times

How to multiply 21 by itself 2 times. In other words, what is 21 multiplied by itself 2 times?

To multiply 21 by itself 2 times is the same as 21 to the power of 2 (21^2) or twenty-one to the second power. Specifically, 21 is the base and 2 is the exponent like this:

21²

21² is 21 multiplied by itself 2 times which is 21 × 21.

Here is how we calculate it:

21
21 × 21 = 441

That is it! Now you know how to multiply 21 by itself 2 times.

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