Alright, let's work through 86416464 times 21048679 step by step
86416464 × 21048679 = 21048679 × (86416464)
+ 21048679 × 4 that equals 84194716
+ 21048679 × 60 giving us 1262920740
+ 21048679 × 400 that is equal 8419471600
+ 21048679 × 6000 that equals 126292074000
+ 21048679 × 10000 which equals 210486790000
+ 21048679 × 400000 that is equal 8419471600000
+ 21048679 × 6000000 which equals 126292074000000
+ 21048679 × 80000000 producing 1683894320000000

= 1818952411051056
