Format specifier %02x
%02x means print at least 2 digits, prepend it with 0's if there's less. In your case it's 7 digits, so you get no extra 0 in front.
Also, %x is for int, but you have a long. Try %08lx instead.
%x is a format specifier that format and output the hex value. If you are providing int or long value, it will convert it to hex value.
%02x means if your provided value is less than two digits then 0 will be prepended.
You provided value 16843009 and it has been converted to 1010101 which a hex value.
Your string is wider than your format width of 2. So there's no padding to be done.