Factorial/Examples/21

Example of Factorial

 * $21! = 51 \, 090 \, 942 \, 171 \, 709 \, 440 \, 000$

Proof
From $20$ Factorial:
 * $20! = 2 \, 432 \, 902 \, 008 \, 176 \, 640 \, 000$

Then: 2 432 902 008 176 640 000 x                       21 --- 2 432 902 008 176 640 000 48 658 040 163 532 800 000 --- 51 090 942 171 709 440 000