[Tex/LaTex] Bold siuntix’s function \num{} in math environment

Question

I am looking for a way to make the \num function displayed in bold when used inside a \begin{equation}. Using \mathbf and \boldmath doesn't work (as boldmath makes the entire equation bold and should be used before instead of inside the environment) and the only thing that does, is using \bfseries which of course produces errors in math mode. So how could this work:

\usepackage{siunitx}


\begin{document}

    \sisetup{detect-weight=true,detect-inline-weight=math}
    \begin{equation}
       V= \frac{0,0003257}{150\cdot 99,96}= \mathbf{\num{2.1723e-8}}
    \end{equation}

\end{document}

Preferably without declaring new commands.

Answer 1

siunitx has never detected \mathbf. But you can change the font by setting the math-rm-key:

\documentclass[12pt]{scrartcl}
\usepackage{siunitx}


\begin{document}


    \begin{equation}
       V= \frac{0,0003257}{150\cdot 99,96}= \num[math-rm=\mathbf]{2.1723e-8}
 \end{equation}

\end{document}