Show Zero value in front of my numbers

I'm working with a set of numbers that are 9 digits long but are not social security numbers so I don't need the dashes. However, some of my numbers may have zero's at the beginning. When I type the 0 number it automatically hides the zero. How can I get the number to show?
For example
Number 005121111 shows as 5121111 but I need the zeros.
Any help would be greatly appreciated!!!!

right click on cell, go to format, click on number tab, in category, click custom, type nine zeroes

Let me know if that works

OMG you are a genious! That worked, thank you so much!

Glad I could help.