It is a semiprime because it is the product of two primes.
It is a congruent number.
Almost surely, 212321013320502 is an apocalyptic number.
12321013320502 is an equidigital number, since it uses as much as digits as its factorization.
12321013320502 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6160506660253.
Adding to 12321013320502 its reverse (20502331012321), we get a palindrome (32823344332823).
The spelling of 12321013320502 in words is "twelve trillion, three hundred twenty-one billion, thirteen million, three hundred twenty thousand, five hundred two".