Alright, let's work through 81899325 times 23464431 step by step
81899325 × 23464431 = 23464431 × (81899325)
+ 23464431 × 5 what gives us 117322155
+ 23464431 × 20 resulting in 469288620
+ 23464431 × 300 which equals 7039329300
+ 23464431 × 9000 what gives us 211179879000
+ 23464431 × 90000 producing 2111798790000
+ 23464431 × 800000 which equals 18771544800000
+ 23464431 × 1000000 resulting in 23464431000000
+ 23464431 × 80000000 that equals 1877154480000000

= 1921721060409075
