Alright, let's work through 2136 times 2129 step by step
2136 × 2129 = 2129 × (2136)
+ 2129 × 6 resulting in 12774
+ 2129 × 30 that is equal 63870
+ 2129 × 100 giving us 212900
+ 2129 × 2000 that is equal 4258000

= 4547544
