63.
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111111
The number 21 in binary is 10101
It is 894.
1024 = 10000000000
To add the binary numbers 101010 and 111111, you start by adding the rightmost bits: 0 + 1 = 1. Moving left, 1 + 1 = 10 in binary (2 in decimal), so you write down 0 and carry over the 1. Continuing this process, you get: 101010 + 111111 = 1100001 in binary (97 in decimal).