Alright, let's work through 85771021 times 81520468 step by step
85771021 × 81520468 = 81520468 × (85771021)
+ 81520468 × 1 that results in 81520468
+ 81520468 × 20 resulting in 1630409360
+ 81520468 × 000 that equals 0
+ 81520468 × 1000 that results in 81520468000
+ 81520468 × 70000 giving us 5706432760000
+ 81520468 × 700000 what gives us 57064327600000
+ 81520468 × 5000000 that results in 407602340000000
+ 81520468 × 80000000 resulting in 6521637440000000

= 6992093772757828
