Alright, let's work through 77223759 times 39102021 step by step
77223759 × 39102021 = 39102021 × (77223759)
+ 39102021 × 9 that is equal 351918189
+ 39102021 × 50 giving us 1955101050
+ 39102021 × 700 resulting in 27371414700
+ 39102021 × 3000 that is equal 117306063000
+ 39102021 × 20000 giving us 782040420000
+ 39102021 × 200000 that results in 7820404200000
+ 39102021 × 7000000 that is equal 273714147000000
+ 39102021 × 70000000 resulting in 2737141470000000

= 3019605046116939
