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$2,0.123,\mathrm{1,000,000},2.1e10,\mathrm{0xFFEF},\mathrm{MCMLXIX},\mathrm{twenty\; one}$

Source Code:

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