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Well, 1 is equal to 1. 9 is equal to 9. So any number from 0 to 9. I do not think this is what is meant by the question. If you mean any number with more than one digit. There is no such number. Because 11 sums to 2. 19 sums to 10. 21 sums to 3. 29 sums to 11. 111 sums 3. 119 sums to 11. The sums do not grow as fast the increase of digits.

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Q: Which is the only number which is equal to the sum of its digits?

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56

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18 is the only number that matches these criteria.

A dozen is equal to 12. The sum of the digits of 12 are 1 + 2 = 3.

The number is 45. The sum of its digits i.e. 4+5=9 Five times the sum of its digits i.e. 5 times 9 which is 45

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