Alright, let's work through 2821 times 7723 step by step
2821 × 7723 = 7723 × (2821)
+ 7723 × 1 that results in 7723
+ 7723 × 20 which equals 154460
+ 7723 × 800 producing 6178400
+ 7723 × 2000 yielding 15446000

= 21786583
