Alright, let's work through 8721 times 1986 step by step
8721 × 1986 = 1986 × (8721)
+ 1986 × 1 producing 1986
+ 1986 × 20 producing 39720
+ 1986 × 700 that equals 1390200
+ 1986 × 8000 yielding 15888000

= 17319906
