Alright, let's work through 1821 times 2865 step by step
1821 × 2865 = 2865 × (1821)
+ 2865 × 1 yielding 2865
+ 2865 × 20 which equals 57300
+ 2865 × 800 that is equal 2292000
+ 2865 × 1000 that results in 2865000

= 5217165
