No problem, we've got 2109 and 8001 to multiply
2109 × 8001 = 8001 × (2109)
+ 8001 × 9 what gives us 72009
+ 8001 × 00 resulting in 0
+ 8001 × 100 giving us 800100
+ 8001 × 2000 what gives us 16002000

= 16874109
