Alright, let's work through 21425414 times 87728439 step by step
21425414 × 87728439 = 87728439 × (21425414)
+ 87728439 × 4 which equals 350913756
+ 87728439 × 10 resulting in 877284390
+ 87728439 × 400 yielding 35091375600
+ 87728439 × 5000 that equals 438642195000
+ 87728439 × 20000 yielding 1754568780000
+ 87728439 × 400000 producing 35091375600000
+ 87728439 × 1000000 producing 87728439000000
+ 87728439 × 20000000 giving us 1754568780000000

= 1879618125148746
