Alright, let's work through 81234997 times 10209482 step by step
81234997 × 10209482 = 10209482 × (81234997)
+ 10209482 × 7 that is equal 71466374
+ 10209482 × 90 producing 918853380
+ 10209482 × 900 yielding 9188533800
+ 10209482 × 4000 yielding 40837928000
+ 10209482 × 30000 producing 306284460000
+ 10209482 × 200000 producing 2041896400000
+ 10209482 × 1000000 that equals 10209482000000
+ 10209482 × 80000000 producing 816758560000000

= 829367239641554
