Alright, let's work through 99877889 times 21724500 step by step
99877889 × 21724500 = 21724500 × (99877889)
+ 21724500 × 9 that equals 195520500
+ 21724500 × 80 giving us 1737960000
+ 21724500 × 800 that equals 17379600000
+ 21724500 × 7000 which equals 152071500000
+ 21724500 × 70000 yielding 1520715000000
+ 21724500 × 800000 that results in 17379600000000
+ 21724500 × 9000000 resulting in 195520500000000
+ 21724500 × 90000000 which equals 1955205000000000

= 2169797199580500
