Eleventy

Compounds with other numerals: eleventy-one (111), eleventy-six (116), eleventy first (one-hundred and eleventh), etc.

[Bilbo] announced that he would shortly be celebrating his eleventy-first birthday […] “Today is my one hundred and eleventh birthday: I am eleventy-one today!”

without having to go back through the thousand and eleventy-three days to alter the plan

Eight-Oh-Two-Dot-Eleventy Something [= 802.11a, 802.11b, etc.]

No grown-up people, no babies, no girls. It was a world of boys, eleventy and a hundred strong.

People used to think that the first eleventy letters of the DNA message would comprise Gene 1.

According to a study by me, this generates a multibillion facepalm for the UK economy, making everyone who considers it at least eleventy hundred pounds unhappier.