Alright, let's work through 9987 times 2321 step by step
9987 × 2321 = 2321 × (9987)
+ 2321 × 7 resulting in 16247
+ 2321 × 80 what gives us 185680
+ 2321 × 900 that is equal 2088900
+ 2321 × 9000 what gives us 20889000

= 23179827
