Alright, let's work through 4821 times 4109 step by step
4821 × 4109 = 4109 × (4821)
+ 4109 × 1 that is equal 4109
+ 4109 × 20 producing 82180
+ 4109 × 800 that equals 3287200
+ 4109 × 4000 which equals 16436000

= 19809489
