Alright, let's work through 2121 times 7216 step by step
2121 × 7216 = 7216 × (2121)
+ 7216 × 1 that results in 7216
+ 7216 × 20 resulting in 144320
+ 7216 × 100 producing 721600
+ 7216 × 2000 producing 14432000

= 15305136
