The only page numbering that Tableau offers for exported PDFs that I know of is inserting the Page # for the field(s) on the Pages Shelf.
Tableau does not have all the features of a traditional tabular reporting tool, it wasn’t designed that way.
Yeah Make Sense Jonathan.
I found an alternative solution for this, after exporting we edit the PDF and insert the page number as we don't have the option available in Tableau.
And i think this is one which Tableau software has to implement.