Alright, let's work through 31212657 times 8128302 step by step
31212657 × 8128302 = 8128302 × (31212657)
+ 8128302 × 7 giving us 56898114
+ 8128302 × 50 what gives us 406415100
+ 8128302 × 600 resulting in 4876981200
+ 8128302 × 2000 that is equal 16256604000
+ 8128302 × 10000 yielding 81283020000
+ 8128302 × 200000 producing 1625660400000
+ 8128302 × 1000000 which equals 8128302000000
+ 8128302 × 30000000 yielding 243849060000000

= 253705902318414
