“Page intentionally left blank” with twoside openright

Question

I'm using twoside,openright in my document class, and I'm wondering how to have "Page intentionally left blank" text on the pages that openright makes blank. I've seen people redefining \cleardoublepage however this looks like it only works if you're using \cleardoublepage explicitly in the document

EDIT Just found that that redefinition works fine actually! How would I add a page number into the following?

\makeatletter
\def\cleardoublepage{\clearpage\if@twoside%
    \ifodd\c@page\else
    \vspace*{\fill}
    \hfill
    \begin{center}
    This page intentionally left blank.
    \end{center}
    \vspace{\fill}
    \thispagestyle{empty}
    \newpage
    \if@twocolumn\hbox{}\newpage\fi\fi\fi
}
\makeatother

Answer 1

The following gives the expected result, use \thispagestle{plain} to get a pagenumber. Stolen from How to make intentionally left blank pages?

\makeatletter
\def\cleardoublepage{\clearpage\if@twoside%
    \ifodd\c@page\else
    \vspace*{\fill}
    \hfill
    \begin{center}
    This page intentionally left blank.
    \end{center}
    \vspace{\fill}
    \thispagestyle{empty}
    \newpage
    \if@twocolumn\hbox{}\newpage\fi\fi\fi
}
\makeatother