Alright, let's work through 2126 times 5817 step by step
2126 × 5817 = 5817 × (2126)
+ 5817 × 6 that equals 34902
+ 5817 × 20 yielding 116340
+ 5817 × 100 resulting in 581700
+ 5817 × 2000 yielding 11634000

= 12366942
