No problem, we've got 2165 and 8421 to multiply
2165 × 8421 = 8421 × (2165)
+ 8421 × 5 what gives us 42105
+ 8421 × 60 which equals 505260
+ 8421 × 100 that equals 842100
+ 8421 × 2000 yielding 16842000

= 18231465
