How do I write, 21, sq rt sign, 584539/258295 - 1 on a calculator to get the right answer?

How do I write, 21, sq rt sign, 584539/258295 - 1 on a calculator to get the right answer?

On the web2 calc

21*sqrt(584539/258295)-1

$${\mathtt{21}}{\mathtt{\,\times\,}}{\sqrt{{\frac{{\mathtt{584\,539}}}{{\mathtt{258\,295}}}}}}{\mathtt{\,-\,}}{\mathtt{1}} = {\mathtt{30.591\: \!339\: \!533\: \!207\: \!363}}$$

Is that what you mean?