Alright, let's work through 21399172 times 38339034 step by step
21399172 × 38339034 = 38339034 × (21399172)
+ 38339034 × 2 that is equal 76678068
+ 38339034 × 70 that equals 2683732380
+ 38339034 × 100 yielding 3833903400
+ 38339034 × 9000 that equals 345051306000
+ 38339034 × 90000 that is equal 3450513060000
+ 38339034 × 300000 which equals 11501710200000
+ 38339034 × 1000000 yielding 38339034000000
+ 38339034 × 20000000 resulting in 766780680000000

= 820423582879848
