Stage #6: Prototypical Puzzle

Here's an interesting puzzle I thought of one day. I will be pleased if you are enjoy it.

A pic with a bunch of letters

Across

  1. The largest "supersingular" prime
  2. Not a number, but a free man
  3. The single perfect number, so to speak.
  4. Toronto-based Canadian pizza chain
  5. An upside-down American emergency
  6. The minimum age required to run for President of Poland
  7. Cornets - Trombones = ?
  8. Year of birth of the Roman emperor Augustus
  9. The standard number of teeth an adult human has (assuming none are pulled)
  10. (As of the time this was made) The second highest recorded point total by an NBA player in one game

Down

  1. Famous studio in Manhattan
  2. "RPM" of middle-speed vinyl record
  3. The first two-digit "triangular" and "square" number
  4. Hubble Telescope daily report released on May 11th, 2006
  5. Beatmania IIDX "training" song by DJ nagureo
  6. One more than the second highest 3-digit Fibonacci number
  7. "Brand marketing operating unit of Lighthouse Global Network"
  8. One short of THE definitive answer to everything.
  9. Number of elements, according to East Asian tradition
  10. The Italian equivalent of "unlucky 13" in American culture