The binary equivalent would be... 1010101101011101 - There is a multi-functional calculator built-in to Windows which can covert numbers between Hex, Decimal, Octal and Binary.
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The number 21 in binary is 10101
The binary number for 25 is 11001. This is because binary is a base-2 number system, meaning each digit can only be 0 or 1. To convert the decimal number 25 to binary, you divide 25 by 2 repeatedly, noting the remainders from each division. Reading the remainders from bottom to top gives you the binary equivalent.
The number 21 in binary is 10101
binary
It is 15 in base 10.