Alright, let's work through 2158 times 5801 step by step
2158 × 5801 = 5801 × (2158)
+ 5801 × 8 producing 46408
+ 5801 × 50 that is equal 290050
+ 5801 × 100 that equals 580100
+ 5801 × 2000 resulting in 11602000

= 12518558
