No problem, we've got 2447 and 6321 to multiply
2447 × 6321 = 6321 × (2447)
+ 6321 × 7 what gives us 44247
+ 6321 × 40 producing 252840
+ 6321 × 400 giving us 2528400
+ 6321 × 2000 resulting in 12642000

= 15467487
