Alright, let's work through 2112 times 6453 step by step
2112 × 6453 = 6453 × (2112)
+ 6453 × 2 that equals 12906
+ 6453 × 10 resulting in 64530
+ 6453 × 100 producing 645300
+ 6453 × 2000 that equals 12906000

= 13628736
