No problem, we've got 5020 and 4239 to multiply
5020 × 4239 = 4239 × (5020)
+ 4239 × 0 producing 0
+ 4239 × 20 what gives us 84780
+ 4239 × 000 giving us 0
+ 4239 × 5000 yielding 21195000

= 21279780
