Alright, let's work through 1691 times 8021 step by step
1691 × 8021 = 8021 × (1691)
+ 8021 × 1 that is equal 8021
+ 8021 × 90 what gives us 721890
+ 8021 × 600 what gives us 4812600
+ 8021 × 1000 which equals 8021000

= 13563511
