Alright, let's work through 71241421 times 86198813 step by step
71241421 × 86198813 = 86198813 × (71241421)
+ 86198813 × 1 that results in 86198813
+ 86198813 × 20 that equals 1723976260
+ 86198813 × 400 that is equal 34479525200
+ 86198813 × 1000 what gives us 86198813000
+ 86198813 × 40000 which equals 3447952520000
+ 86198813 × 200000 giving us 17239762600000
+ 86198813 × 1000000 which equals 86198813000000
+ 86198813 × 70000000 that is equal 6033916910000000

= 6140925926633273
