Alright, let's work through 13723573 times 99099991 step by step
13723573 × 99099991 = 99099991 × (13723573)
+ 99099991 × 3 giving us 297299973
+ 99099991 × 70 giving us 6936999370
+ 99099991 × 500 what gives us 49549995500
+ 99099991 × 3000 that equals 297299973000
+ 99099991 × 20000 that results in 1981999820000
+ 99099991 × 700000 which equals 69369993700000
+ 99099991 × 3000000 resulting in 297299973000000
+ 99099991 × 10000000 what gives us 990999910000000

= 1360005960787843
