421 kilometers in centimeters

Conversion formula
How to convert 421 kilometers to centimeters?

We know (by definition) that: $1\mathrm{km}=100000\mathrm{cm}$

We can set up a proportion to solve for the number of centimeters.

Now, we cross multiply to solve for our unknown $x$:

Conclusion: 421 ⁢ km = 42100000 ⁢ cm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 centimeter is equal to 2.37529691211401e-08 times 421 kilometers.

It can also be expressed as: 421 kilometers is equal to $\frac{1}{\mathrm{2.37529691211401e-08}}$ centimeters.

Approximation

An approximate numerical result would be: four hundred and twenty-one kilometers is about forty-two million, one hundred thousand centimeters, or alternatively, a centimeter is about zero times four hundred and twenty-one kilometers.