Alright, let's work through 21154208 times 99764395 step by step
21154208 × 99764395 = 99764395 × (21154208)
+ 99764395 × 8 producing 798115160
+ 99764395 × 00 yielding 0
+ 99764395 × 200 that equals 19952879000
+ 99764395 × 4000 resulting in 399057580000
+ 99764395 × 50000 that is equal 4988219750000
+ 99764395 × 100000 that equals 9976439500000
+ 99764395 × 1000000 producing 99764395000000
+ 99764395 × 20000000 resulting in 1995287900000000

= 2110436762824160
