No problem, we've got 6821 and 3549 to multiply
6821 × 3549 = 3549 × (6821)
+ 3549 × 1 what gives us 3549
+ 3549 × 20 that equals 70980
+ 3549 × 800 which equals 2839200
+ 3549 × 6000 producing 21294000

= 24207729
