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Hint: Here we have to find the cube of a number which means a number multiplied by itself three times. So we multiply it by itself 3 times.

Here the given number is 21.

We have to find its cube which can be also written as ${(21)^3}$.

i.e. ${(21)^3} = 21 \times 21 \times 21$

After multiplying the numbers we get that the cube of 21 is 9261.

Therefore the answer is 9261.

Note: Whenever we face such a type of question, we have to first know what the meaning of the cube is and then apply its properties on how to find the cube. We just simply multiplied a number by itself three times to find the cube.

Here the given number is 21.

We have to find its cube which can be also written as ${(21)^3}$.

i.e. ${(21)^3} = 21 \times 21 \times 21$

After multiplying the numbers we get that the cube of 21 is 9261.

Therefore the answer is 9261.

Note: Whenever we face such a type of question, we have to first know what the meaning of the cube is and then apply its properties on how to find the cube. We just simply multiplied a number by itself three times to find the cube.