Alright, let's work through 21381806 times 87838648 step by step
21381806 × 87838648 = 87838648 × (21381806)
+ 87838648 × 6 which equals 527031888
+ 87838648 × 00 which equals 0
+ 87838648 × 800 resulting in 70270918400
+ 87838648 × 1000 yielding 87838648000
+ 87838648 × 80000 that is equal 7027091840000
+ 87838648 × 300000 which equals 26351594400000
+ 87838648 × 1000000 giving us 87838648000000
+ 87838648 × 20000000 resulting in 1756772960000000

= 1878148930838288
