Alright, let's work through 71635610 times 21531849 step by step
71635610 × 21531849 = 21531849 × (71635610)
+ 21531849 × 0 giving us 0
+ 21531849 × 10 that is equal 215318490
+ 21531849 × 600 yielding 12919109400
+ 21531849 × 5000 yielding 107659245000
+ 21531849 × 30000 giving us 645955470000
+ 21531849 × 600000 resulting in 12919109400000
+ 21531849 × 1000000 yielding 21531849000000
+ 21531849 × 70000000 that results in 1507229430000000

= 1542447137542890
