Alright, let's work through 82122421 times 51330398 step by step
82122421 × 51330398 = 51330398 × (82122421)
+ 51330398 × 1 what gives us 51330398
+ 51330398 × 20 giving us 1026607960
+ 51330398 × 400 producing 20532159200
+ 51330398 × 2000 that is equal 102660796000
+ 51330398 × 20000 resulting in 1026607960000
+ 51330398 × 100000 giving us 5133039800000
+ 51330398 × 2000000 that equals 102660796000000
+ 51330398 × 80000000 resulting in 4106431840000000

= 4215376554653558
