Well I assume your talking about fractions. I also assume you meant twelve twentieths (u do alot of assuming) but if that is what you meant I shall answer...
3/5 (3 fifths)
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It is already in simplest form.
If you want all the numbers added, it's 13212. If not, then it is impossible to write or type twelve thousand twelve hundred twelve in simplest form.
Six sevenths
3 wholes
2/5