sed, 38 bytes

Result [link]

WA

Code [DL]

eecho "obase=10; ibase=2; 101001" | bc

stdin

0100001110101011001111101110011011011100000100010001001101000001010101101000001101111010011010011101

stdout

41
0100001110101011001111101110011011011100000100010001001101000001010101101000001101111010011010011101

stderr

strace