Let's calculate 5621 x 5122
5621 × 5122 = 5122 × (5621)
+ 5122 × 1 what gives us 5122
+ 5122 × 20 that results in 102440
+ 5122 × 600 what gives us 3073200
+ 5122 × 5000 resulting in 25610000

= 28790762
