# Self reference is a pain [duplicate]

How many letters do the answer of this puzzle contain?

NB: This came across while web surfing. I don't claim any ownership rights.

May be

four

Logic

None of the other digits expressed in words have appropriate word-length

• Interesting alternate answer would be 0. – greenturtle3141 Sep 1 '17 at 6:21
• That is a good interesting deviation! Kudos – Jyotish Robin Sep 1 '17 at 9:29

• any hint as to why? – JMP Sep 1 '17 at 7:11
• Just count the letters... – Gamow Sep 1 '17 at 7:20

fourteen plus three

Which contains exactly

17 letters

• And seven plus seven, fifteen times one, one followed by six, etc. – Engineer Toast Sep 1 '17 at 12:48

4 (Four)

Reason

it is the only number that contains the same number of letters to spell it. This speaks to the title, as it is self referential.

It is

21, as the number of letters in