Alright, let's work through 21720149 times 79618816 step by step
21720149 × 79618816 = 79618816 × (21720149)
+ 79618816 × 9 which equals 716569344
+ 79618816 × 40 which equals 3184752640
+ 79618816 × 100 giving us 7961881600
+ 79618816 × 0000 resulting in 0
+ 79618816 × 20000 producing 1592376320000
+ 79618816 × 700000 giving us 55733171200000
+ 79618816 × 1000000 producing 79618816000000
+ 79618816 × 20000000 giving us 1592376320000000

= 1729332546723584
