No problem, we've got 4065 and 5187 to multiply
4065 × 5187 = 5187 × (4065)
+ 5187 × 5 giving us 25935
+ 5187 × 60 resulting in 311220
+ 5187 × 000 which equals 0
+ 5187 × 4000 giving us 20748000

= 21085155
