It is a congruent number.
Almost surely, 221232223032120 is an apocalyptic number.
21232223032120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21232223032120 is a wasteful number, since it uses less digits than its factorization.
21232223032120 is an odious number, because the sum of its binary digits is odd.
Adding to 21232223032120 its reverse (2123032223212), we get a palindrome (23355255255332).
The spelling of 21232223032120 in words is "twenty-one trillion, two hundred thirty-two billion, two hundred twenty-three million, thirty-two thousand, one hundred twenty".