No problem, we've got 4099 and 1521 to multiply
4099 × 1521 = 1521 × (4099)
+ 1521 × 9 that results in 13689
+ 1521 × 90 yielding 136890
+ 1521 × 000 producing 0
+ 1521 × 4000 yielding 6084000

= 6234579
