No problem, we've got 5399 and 4072 to multiply
5399 × 4072 = 4072 × (5399)
+ 4072 × 9 which equals 36648
+ 4072 × 90 which equals 366480
+ 4072 × 300 giving us 1221600
+ 4072 × 5000 what gives us 20360000

= 21984728
