No problem, we've got 4221 and 6370 to multiply
4221 × 6370 = 6370 × (4221)
+ 6370 × 1 that equals 6370
+ 6370 × 20 that equals 127400
+ 6370 × 200 what gives us 1274000
+ 6370 × 4000 that results in 25480000

= 26887770
