Alright, let's work through 6684858 times 21504307 step by step
6684858 × 21504307 = 21504307 × (6684858)
+ 21504307 × 8 yielding 172034456
+ 21504307 × 50 giving us 1075215350
+ 21504307 × 800 resulting in 17203445600
+ 21504307 × 4000 what gives us 86017228000
+ 21504307 × 80000 what gives us 1720344560000
+ 21504307 × 600000 that results in 12902584200000
+ 21504307 × 6000000 what gives us 129025842000000

= 143753238683406
