No problem, we've got 2571 and 6420 to multiply
2571 × 6420 = 6420 × (2571)
+ 6420 × 1 that is equal 6420
+ 6420 × 70 which equals 449400
+ 6420 × 500 that equals 3210000
+ 6420 × 2000 which equals 12840000

= 16505820
