100000 2847239582
2178
81.
7 two-digit numbers.
987654321 is the highest nine-digit number with no repeated digits.
Find a four digit number whose digits will be reversed when multiplied by nine?
If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.
An eight digit number with one zero cannot remain the same when its digits are reversed. It must have an even number of 0s.
45
17
100000 2847239582
2178
The number is 36
47 Impossible problem!
22 digits is verbally expressed with "Sextillion"
2178 * 4 = 8712
192