21 ‖ number twenty one

integer, natural,
positive, counting number, odd

composite

21 ― 12^nd composite number,
divisible by 1, 3, 7 & 21
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0. bin code

   0011001000110001

1. url code

   %32%31

2. html codes

   • 21
   • 21

3. css codes

   • \0032\0031
   • \32\31

4. js codes

   • \u0032\u0031
   • \u{32}\u{31}
   • \x32\x31

relates

• n.31
• n.32
• n.49
• n.50