A 10-digit number satisfying the following property. Number the digits 0 to 9, and let digit be the number of s in the number. There is exactly one such number: 6210001000.

Pickover, C. A. "Chaos in Ontario." Ch. 28 in Keys to Infinity. New York: Wiley, pp. 217-219, 1995.

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Weisstein, Eric W. "Self-Descriptive Number." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Self-DescriptiveNumber.html