I hadn't heard of a "nonillion" before, so I looked it up[0].

  often attributive
  US : a number equal to 1 followed by 30 zeros
    -> see Table of Numbers
  also, British : a number equal to 1 followed by 54 zeros
    -> see Table of Numbers

Hopefully that clears things up. /s

[0] https://www.merriam-webster.com/dictionary/nonillion