Alright, let's work through 81206293 times 84292021 step by step
81206293 × 84292021 = 84292021 × (81206293)
+ 84292021 × 3 that results in 252876063
+ 84292021 × 90 giving us 7586281890
+ 84292021 × 200 that is equal 16858404200
+ 84292021 × 6000 resulting in 505752126000
+ 84292021 × 00000 that results in 0
+ 84292021 × 200000 which equals 16858404200000
+ 84292021 × 1000000 what gives us 84292021000000
+ 84292021 × 80000000 that is equal 6743361680000000

= 6845042554888153
