Alright, let's work through 8645 times 2100 step by step
8645 × 2100 = 2100 × (8645)
+ 2100 × 5 which equals 10500
+ 2100 × 40 resulting in 84000
+ 2100 × 600 producing 1260000
+ 2100 × 8000 that equals 16800000

= 18154500
