It is a strong prime.
It is a cyclic number.
It is a Sophie Germain prime.
It is a congruent number.
Almost surely, 212321013320503 is an apocalyptic number.
12321013320503 is an equidigital number, since it uses as much as digits as its factorization.
12321013320503 is an evil number, because the sum of its binary digits is even.
Adding to 12321013320503 its reverse (30502331012321), we get a palindrome (42823344332824).
The spelling of 12321013320503 in words is "twelve trillion, three hundred twenty-one billion, thirteen million, three hundred twenty thousand, five hundred three".