Alright, let's work through 8136 times 8321 step by step
8136 × 8321 = 8321 × (8136)
+ 8321 × 6 that equals 49926
+ 8321 × 30 resulting in 249630
+ 8321 × 100 which equals 832100
+ 8321 × 8000 that results in 66568000

= 67699656
