No problem, we've got 3864 and 5021 to multiply
3864 × 5021 = 5021 × (3864)
+ 5021 × 4 what gives us 20084
+ 5021 × 60 resulting in 301260
+ 5021 × 800 which equals 4016800
+ 5021 × 3000 yielding 15063000

= 19401144
