No problem, we've got 3129 and 6817 to multiply
3129 × 6817 = 6817 × (3129)
+ 6817 × 9 which equals 61353
+ 6817 × 20 producing 136340
+ 6817 × 100 that equals 681700
+ 6817 × 3000 that equals 20451000

= 21330393
