When counting things, it's customarily recited immediately after ' 12 '.
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no, it is no. the number 13 is a real number. It is not imaginary.
There are two roots, both real: -13 and +13
A connection is 13 is a baker's dozen.
Its the thirteenth number. It's abosolute value is 13. It's opposite is -13. If you add 87 to it, it equals 100. It's before 14. It's after 12. Its a natural number. 13x2 is 26. It's a real number. Its rational (it can be turned into a fraction). (Just for fun.) It is supposedly an unlucky number.
It's not a real number, it is an expression that means somewhere between 13 and 19 of whatever you are discussing.