The next odd number after any odd number is found by adding 2. If you add only 1 you get an even number. So, 9999 + 2 = 10001
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This is impossible. 21 is an odd number and all these digits are odd. Whenever you add 6 odd numbers together, the answer is always even!
It is 9999 (if a one is added, it becomes a five digit number: 9999 + 1 = 10,000)
There are 120 of them.