Alright, let's work through 5421 times 5272 step by step
5421 × 5272 = 5272 × (5421)
+ 5272 × 1 what gives us 5272
+ 5272 × 20 yielding 105440
+ 5272 × 400 that is equal 2108800
+ 5272 × 5000 giving us 26360000

= 28579512
