Alright, let's work through 5891 times 3661 step by step
5891 × 3661 = 3661 × (5891)
+ 3661 × 1 that equals 3661
+ 3661 × 90 what gives us 329490
+ 3661 × 800 yielding 2928800
+ 3661 × 5000 what gives us 18305000

= 21566951
