Alright, let's work through 21636120 times 19722502 step by step
21636120 × 19722502 = 19722502 × (21636120)
+ 19722502 × 0 that results in 0
+ 19722502 × 20 that is equal 394450040
+ 19722502 × 100 giving us 1972250200
+ 19722502 × 6000 what gives us 118335012000
+ 19722502 × 30000 that equals 591675060000
+ 19722502 × 600000 which equals 11833501200000
+ 19722502 × 1000000 that equals 19722502000000
+ 19722502 × 20000000 which equals 394450040000000

= 426718419972240
