Answer:
A terabyte is a trillion (short scale) bytes, 1012 bytes, or 1000 gigabytes.
The four larger official prefixes are:
petabyte = 1015 bytes = 1000 terabytes
exabyte = 1018 bytes
zettabyte = 1021 bytes
yottabyte = 1024 bytes
For values based on 1024 rather than 1000:
tebibyte = 240 bytes = 1024 gibibytes (giga-binary-bytes)
pebibyte = 250 bytes
exbibyte = 260 bytes
zebibyte = 270 bytes
yobibyte = 280 bytes