Alright, let's work through 5309 times 3971 step by step
5309 × 3971 = 3971 × (5309)
+ 3971 × 9 that is equal 35739
+ 3971 × 00 yielding 0
+ 3971 × 300 that results in 1191300
+ 3971 × 5000 resulting in 19855000

= 21082039
