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2109=6.49037107*1032
2109
1900 190 + 19 -------- 2109
Yes. Rational numbers have a terminating decimal digit or a non-terminating recurring decimal digit. Rational numbers are generally expressed in the form (p/q) where 'q' does not equal 0. 21.09 can be written as (2109/100) which is of the (p/q) form and 'q' is not equal to zero.
It will happen once every 100 years. September 9th will occur once a year, and the '09 year will happen in 2009, 2109, 2209, etc.