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Decillion may mean either of the two numbers (depending if a short or long scale country)

  • 1,000,000,000,000,000,000,000,000,000,000,000 (1033) for all short scale countries
  • 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 (1060) for all long scale countries.

The cardinal number is decillion and the ordinal is decillionth.

The Planck length, a unit of length, is equal to 1.616199(97)×10−35 metres, or approximately a hundred-decillionth of a metre.