199999.
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The smallest 5 digit integer is -99999. The largest 5 digit integer is 99999. The sum is therefore 0.
The greatest 3-digit number is 999. 9+9+9 = 27 The sum of the greatest 3-digit number is 27.
910
As the number is odd it must end in an odd digit; the odd digits are 1, 3, 5, 7, 9 and the smallest is 1 which is the sum of 1 and 0. Thus the smallest 7-digit number which meets your criteria is 1,001,001
There are 5460 five digit numbers with a digit sum of 22.