321321221213 has 4 divisors (see below), whose sum is σ = 325846872288. Its totient is φ = 316795570140.

The previous prime is 321321221209. The next prime is 321321221251. The reversal of 321321221213 is 312122123123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 321321221213 - 2² = 321321221209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321321221113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2262825431 + ... + 2262825572.

It is an arithmetic number, because the mean of its divisors is an integer number (81461718072).

Almost surely, 2^321321221213 is an apocalyptic number.

It is an amenable number.

321321221213 is a deficient number, since it is larger than the sum of its proper divisors (4525651075).

321321221213 is an equidigital number, since it uses as much as digits as its factorization.

321321221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4525651074.

The product of its digits is 864, while the sum is 23.

Adding to 321321221213 its reverse (312122123123), we get a palindrome (633443344336).

The spelling of 321321221213 in words is "three hundred twenty-one billion, three hundred twenty-one million, two hundred twenty-one thousand, two hundred thirteen".