Alright, let's work through 71002110 times 56638455 step by step
71002110 × 56638455 = 56638455 × (71002110)
+ 56638455 × 0 giving us 0
+ 56638455 × 10 which equals 566384550
+ 56638455 × 100 which equals 5663845500
+ 56638455 × 2000 that equals 113276910000
+ 56638455 × 00000 producing 0
+ 56638455 × 000000 that is equal 0
+ 56638455 × 1000000 what gives us 56638455000000
+ 56638455 × 70000000 producing 3964691850000000

= 4021449812140050
