Alright, let's work through 6421 times 6510 step by step
6421 × 6510 = 6510 × (6421)
+ 6510 × 1 giving us 6510
+ 6510 × 20 resulting in 130200
+ 6510 × 400 giving us 2604000
+ 6510 × 6000 giving us 39060000

= 41800710
