No problem, we've got 4391 and 5100 to multiply
4391 × 5100 = 5100 × (4391)
+ 5100 × 1 that is equal 5100
+ 5100 × 90 that equals 459000
+ 5100 × 300 yielding 1530000
+ 5100 × 4000 giving us 20400000

= 22394100
