Alright, let's work through 20221173 times 81045319 step by step
20221173 × 81045319 = 81045319 × (20221173)
+ 81045319 × 3 what gives us 243135957
+ 81045319 × 70 which equals 5673172330
+ 81045319 × 100 what gives us 8104531900
+ 81045319 × 1000 which equals 81045319000
+ 81045319 × 20000 yielding 1620906380000
+ 81045319 × 200000 what gives us 16209063800000
+ 81045319 × 0000000 that is equal 0
+ 81045319 × 20000000 that is equal 1620906380000000

= 1638831416339187
