Alright, let's work through 2131 times 8481 step by step
2131 × 8481 = 8481 × (2131)
+ 8481 × 1 which equals 8481
+ 8481 × 30 resulting in 254430
+ 8481 × 100 that results in 848100
+ 8481 × 2000 giving us 16962000

= 18073011
