The number 521001000 is a number that describes itself because the digits represent the number of occurrences of each digit specified. That is, 5 represents the number of zeroes, 2 represents the number of ones, and so on.

Another example of this number would be 3211000 which has 3 zeroes, 2 ones, 1 two, and so on.

What is the smallest number that exhibits this property?

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