The zettabyte is a multiple of the unit byte for digital information. The prefix zetta indicates the seventh power of 1000 and means 10²¹ in the International System of Units, and therefore one zettabyte is one sextillion bytes. The unit symbol is ZB. 1 ZB = 1000000000000000000000bytes = 10007bytes = 10²¹bytes = 1000exabytes. A related unit, the zebibyte, using a binary prefix, means 10247bytes.