No problem, we've got 5154 and 4085 to multiply
5154 × 4085 = 4085 × (5154)
+ 4085 × 4 what gives us 16340
+ 4085 × 50 producing 204250
+ 4085 × 100 producing 408500
+ 4085 × 5000 what gives us 20425000

= 21054090
