Alright, let's work through 82121711 times 38658545 step by step
82121711 × 38658545 = 38658545 × (82121711)
+ 38658545 × 1 what gives us 38658545
+ 38658545 × 10 that results in 386585450
+ 38658545 × 700 which equals 27060981500
+ 38658545 × 1000 that equals 38658545000
+ 38658545 × 20000 what gives us 773170900000
+ 38658545 × 100000 producing 3865854500000
+ 38658545 × 2000000 what gives us 77317090000000
+ 38658545 × 80000000 that is equal 3092683600000000

= 3174705860170495
