Let's calculate 21027512 x 20113398
21027512 × 20113398 = 20113398 × (21027512)
+ 20113398 × 2 producing 40226796
+ 20113398 × 10 yielding 201133980
+ 20113398 × 500 that results in 10056699000
+ 20113398 × 7000 that equals 140793786000
+ 20113398 × 20000 resulting in 402267960000
+ 20113398 × 000000 that equals 0
+ 20113398 × 1000000 producing 20113398000000
+ 20113398 × 20000000 producing 402267960000000

= 422934717805776
