Display:

$20.123\mathrm{1,000,000}2.1e10\mathrm{0xFFEF}\mathrm{MCMLXIX}\mathrm{twenty\; one}$

Source:

<mn> 2 </mn>
<mn> 0.123 </mn>
<mn> 1,000,000 </mn>
<mn> 2.1e10 </mn>
<mn> 0xFFEF </mn>
<mn> MCMLXIX </mn>
<mn> twenty one </mn>