Alright, let's work through 2601 times 6810 step by step
2601 × 6810 = 6810 × (2601)
+ 6810 × 1 that results in 6810
+ 6810 × 00 producing 0
+ 6810 × 600 yielding 4086000
+ 6810 × 2000 producing 13620000

= 17712810
