Alright, let's work through 5421 times 3591 step by step
5421 × 3591 = 3591 × (5421)
+ 3591 × 1 producing 3591
+ 3591 × 20 that results in 71820
+ 3591 × 400 that equals 1436400
+ 3591 × 5000 giving us 17955000

= 19466811
