New answers tagged ortografía
The correct form is veinti-. The Real Academia de la Lengua Española (Royal Achademy of Spanish Language), RAE, publishes this and more things on its web page. A list of numbers, where your answer is, is in: (numerales cardinales) http://lema.rae.es/dpd/srv/search?id=rqV8h362gD62vc21qB Which comes from: (numerales) ...
Veintidós is by far the most common as that matches the pronunciation of (as far as I know) every single Spanish-speaker. It used to be acceptable to say veinte y dos and you'll probably see it still once in a while, but as of the 2002 DPD, they are considered antiquated and recommended to be avoided though not strictly incorrect.1 It's curious to note ...
veintidós (22) is correct, veinte y dos is not. It is written in a single word (always) from dieciséis to veintinueve. http://www.donquijote.org/spanishlanguage/spanish-numbers/
It's an adverbial phrase written as two words. It's somewhat recognized in the DRAE, via the judicial sense of de plano meaning "Que se adopta inmediatamente y sin trámites" (plano. de plano. 3.) which was likely picked up and used more colloquially, converting it from an adjective phrase to an adverbial along the way.
As @David explains in his comment it is written de plano.It is not written as a single word. It means directly, going straight to the point.
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