grammatical number - is there limit on the integer allow to use `st`, `nd`, `rd` that ends with 1,2, and 3 accordingly?

I know we use st, nd, rd on numbers before 1, 2, and 3 accordingly... But at what point should the number stop using that.

For example, if we have a number extremely large like 100002, should we still do 100002nd?

Or maybe its up to only two digits?

I read this one btw, When were st, nd, rd, and th, first used

But It did not give the answer I want.

Thanks all!

Answer

It depends on the pronunciation. If you say "This is the one million and second time you told me" then you would write "1000002nd". Do not write "1000002th" unless you pronounce it "one million and twoth" (which is extremely nonstandard).