Alright, let's work through 21767857 times 99000331 step by step
21767857 × 99000331 = 99000331 × (21767857)
+ 99000331 × 7 yielding 693002317
+ 99000331 × 50 which equals 4950016550
+ 99000331 × 800 giving us 79200264800
+ 99000331 × 7000 yielding 693002317000
+ 99000331 × 60000 that equals 5940019860000
+ 99000331 × 700000 giving us 69300231700000
+ 99000331 × 1000000 producing 99000331000000
+ 99000331 × 20000000 resulting in 1980006620000000

= 2155025048160667
