Alright, let's work through 21708385 times 7981658 step by step
21708385 × 7981658 = 7981658 × (21708385)
+ 7981658 × 5 which equals 39908290
+ 7981658 × 80 giving us 638532640
+ 7981658 × 300 that results in 2394497400
+ 7981658 × 8000 what gives us 63853264000
+ 7981658 × 00000 which equals 0
+ 7981658 × 700000 resulting in 5587160600000
+ 7981658 × 1000000 that results in 7981658000000
+ 7981658 × 20000000 which equals 159633160000000

= 173268904802330
