Alright, let's work through 2436 times 2161 step by step
2436 × 2161 = 2161 × (2436)
+ 2161 × 6 producing 12966
+ 2161 × 30 producing 64830
+ 2161 × 400 that is equal 864400
+ 2161 × 2000 producing 4322000

= 5264196
