Alright, let's work through 84210479 times 20181882 step by step
84210479 × 20181882 = 20181882 × (84210479)
+ 20181882 × 9 that results in 181636938
+ 20181882 × 70 what gives us 1412731740
+ 20181882 × 400 that results in 8072752800
+ 20181882 × 0000 that equals 0
+ 20181882 × 10000 that is equal 201818820000
+ 20181882 × 200000 yielding 4036376400000
+ 20181882 × 4000000 which equals 80727528000000
+ 20181882 × 80000000 that is equal 1614550560000000

= 1699525950341478
