Alright, let's work through 9139 times 6421 step by step
9139 × 6421 = 6421 × (9139)
+ 6421 × 9 that equals 57789
+ 6421 × 30 what gives us 192630
+ 6421 × 100 yielding 642100
+ 6421 × 9000 that is equal 57789000

= 58681519
