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QUICK ANSWER
"BTW" is an abbreviation which is often translated as "por cierto", and "by the way" is a phrase which is often translated as "a propósito". Learn more about the difference between "BTW" and "by the way" below.
An abbreviation is the shortened form of a word or group of words (e.g., "UFO" = "unidentified flying object"; "p." = "page").
abbreviation
a. por cierto
BTW, I'm going to be a few minutes late.Por cierto, voy a llegar unos minutos tarde.
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by the way(
bay
 
thuh
 
wey
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. a propósito
By the way, do you have any plans for this evening?A propósito, ¿tienes planes para esta noche?
b. por cierto
I have to leave at noon, by the way.Me tengo que ir a mediodía, por cierto.
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