Alright, let's work through 21708128 times 66115065 step by step
21708128 × 66115065 = 66115065 × (21708128)
+ 66115065 × 8 which equals 528920520
+ 66115065 × 20 resulting in 1322301300
+ 66115065 × 100 resulting in 6611506500
+ 66115065 × 8000 that equals 528920520000
+ 66115065 × 00000 resulting in 0
+ 66115065 × 700000 which equals 46280545500000
+ 66115065 × 1000000 yielding 66115065000000
+ 66115065 × 20000000 producing 1322301300000000

= 1435234293748320
