Alright, let's work through 4129 times 6221 step by step
4129 × 6221 = 6221 × (4129)
+ 6221 × 9 producing 55989
+ 6221 × 20 resulting in 124420
+ 6221 × 100 that is equal 622100
+ 6221 × 4000 which equals 24884000

= 25686509
