It is a self number, because there is not a number n which added to its sum of digits gives 21013220523320.
It is a congruent number.
It is an unprimeable number.
Almost surely, 221013220523320 is an apocalyptic number.
21013220523320 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.
21013220523320 is a wasteful number, since it uses less digits than its factorization.
21013220523320 is an evil number, because the sum of its binary digits is even.
Adding to 21013220523320 its reverse (2332502231012), we get a palindrome (23345722754332).
The spelling of 21013220523320 in words is "twenty-one trillion, thirteen billion, two hundred twenty million, five hundred twenty-three thousand, three hundred twenty".