Alright, let's work through 21208015 times 90950012 step by step
21208015 × 90950012 = 90950012 × (21208015)
+ 90950012 × 5 that results in 454750060
+ 90950012 × 10 producing 909500120
+ 90950012 × 000 which equals 0
+ 90950012 × 8000 that equals 727600096000
+ 90950012 × 00000 yielding 0
+ 90950012 × 200000 which equals 18190002400000
+ 90950012 × 1000000 yielding 90950012000000
+ 90950012 × 20000000 resulting in 1819000240000000

= 1928869218746180
