Alright, let's work through 1821 times 6361 step by step
1821 × 6361 = 6361 × (1821)
+ 6361 × 1 that results in 6361
+ 6361 × 20 resulting in 127220
+ 6361 × 800 producing 5088800
+ 6361 × 1000 yielding 6361000

= 11583381
