Alright, let's work through 4373 times 2121 step by step
4373 × 2121 = 2121 × (4373)
+ 2121 × 3 that results in 6363
+ 2121 × 70 what gives us 148470
+ 2121 × 300 what gives us 636300
+ 2121 × 4000 which equals 8484000

= 9275133
