Multiplying any number by 121

To multiply any number by 121, 

first multiply the given number by 11, using short cut. Then multiply the product obtained by 11 again.

For example, Multiply 8,591 by 121.

Multiply the given number by 11.

8,591 x 11 = 94,501

Multiply the result by 11.

Therefore, 94,501 x 11 = 1,039,511