Alright, let's work through 3821 times 4101 step by step
3821 × 4101 = 4101 × (3821)
+ 4101 × 1 what gives us 4101
+ 4101 × 20 which equals 82020
+ 4101 × 800 that results in 3280800
+ 4101 × 3000 that is equal 12303000

= 15669921
