Alright, let's work through 21512842 times 65429160 step by step
21512842 × 65429160 = 65429160 × (21512842)
+ 65429160 × 2 that equals 130858320
+ 65429160 × 40 that is equal 2617166400
+ 65429160 × 800 giving us 52343328000
+ 65429160 × 2000 resulting in 130858320000
+ 65429160 × 10000 that results in 654291600000
+ 65429160 × 500000 producing 32714580000000
+ 65429160 × 1000000 giving us 65429160000000
+ 65429160 × 20000000 producing 1308583200000000

= 1407567181272720
