Alright, let's work through 4221 times 1516 step by step
4221 × 1516 = 1516 × (4221)
+ 1516 × 1 yielding 1516
+ 1516 × 20 that is equal 30320
+ 1516 × 200 resulting in 303200
+ 1516 × 4000 that equals 6064000

= 6399036
