12321221013 has 8 divisors (see below), whose sum is σ = 18253660800. Its totient is φ = 8214147324.

The previous prime is 12321220997. The next prime is 12321221069. The reversal of 12321221013 is 31012212321.

It is not a de Polignac number, because 12321221013 - 2⁴ = 12321220997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321221083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228170733 + ... + 228170786.

It is an arithmetic number, because the mean of its divisors is an integer number (2281707600).

Almost surely, 2^12321221013 is an apocalyptic number.

It is an amenable number.

12321221013 is a deficient number, since it is larger than the sum of its proper divisors (5932439787).

12321221013 is an equidigital number, since it uses as much as digits as its factorization.

12321221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456341528 (or 456341522 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12321221013 its reverse (31012212321), we get a palindrome (43333433334).

The spelling of 12321221013 in words is "twelve billion, three hundred twenty-one million, two hundred twenty-one thousand, thirteen".