Alright, let's work through 21521902 times 87486274 step by step
21521902 × 87486274 = 87486274 × (21521902)
+ 87486274 × 2 that results in 174972548
+ 87486274 × 00 resulting in 0
+ 87486274 × 900 giving us 78737646600
+ 87486274 × 1000 resulting in 87486274000
+ 87486274 × 20000 producing 1749725480000
+ 87486274 × 500000 giving us 43743137000000
+ 87486274 × 1000000 resulting in 87486274000000
+ 87486274 × 20000000 that results in 1749725480000000

= 1882871015373148
