Alright, let's work through 42400981 times 85971720 step by step
42400981 × 85971720 = 85971720 × (42400981)
+ 85971720 × 1 giving us 85971720
+ 85971720 × 80 what gives us 6877737600
+ 85971720 × 900 which equals 77374548000
+ 85971720 × 0000 which equals 0
+ 85971720 × 00000 that equals 0
+ 85971720 × 400000 which equals 34388688000000
+ 85971720 × 2000000 producing 171943440000000
+ 85971720 × 40000000 yielding 3438868800000000

= 3645285266257320
