No problem, we've got 5421 and 3906 to multiply
5421 × 3906 = 3906 × (5421)
+ 3906 × 1 that is equal 3906
+ 3906 × 20 that equals 78120
+ 3906 × 400 giving us 1562400
+ 3906 × 5000 giving us 19530000

= 21174426
