Alright, let's work through 21371177 times 72089619 step by step
21371177 × 72089619 = 72089619 × (21371177)
+ 72089619 × 7 that equals 504627333
+ 72089619 × 70 that results in 5046273330
+ 72089619 × 100 yielding 7208961900
+ 72089619 × 1000 that results in 72089619000
+ 72089619 × 70000 that equals 5046273330000
+ 72089619 × 300000 that is equal 21626885700000
+ 72089619 × 1000000 which equals 72089619000000
+ 72089619 × 20000000 what gives us 1441792380000000

= 1540640007511563
