it is between 1 and 2 million.the first three digits are the same.the least possible digit is in the thousands place.the greatest possible digit is in the ones place.the hundreds digit is 1 more than the tens digit.the sum of the digits is 21.
111xxxx
1110xxx
1110xx9
3+9+d+d+1=21
2d=8
d=4
1,110,549