Alright, let's work through 8155 times 2111 step by step
8155 × 2111 = 2111 × (8155)
+ 2111 × 5 producing 10555
+ 2111 × 50 that results in 105550
+ 2111 × 100 what gives us 211100
+ 2111 × 8000 yielding 16888000

= 17215205
