Alright, let's work through 5271 times 3994 step by step
5271 × 3994 = 3994 × (5271)
+ 3994 × 1 that results in 3994
+ 3994 × 70 what gives us 279580
+ 3994 × 200 which equals 798800
+ 3994 × 5000 that results in 19970000

= 21052374
