321213023321 has 4 divisors (see below), whose sum is σ = 332289334500. Its totient is φ = 310136712144.

The previous prime is 321213023309. The next prime is 321213023389. The reversal of 321213023321 is 123320312123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123320312123 = 23 ⋅5361752701.

It can be written as a sum of positive squares in 2 ways, for example, as 197192836096 + 124020187225 = 444064^2 + 352165^2 .

It is a cyclic number.

It is not a de Polignac number, because 321213023321 - 2³⁴ = 304033154137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321213023821) 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, 5538155546 + ... + 5538155603.

It is an arithmetic number, because the mean of its divisors is an integer number (83072333625).

Almost surely, 2^321213023321 is an apocalyptic number.

It is an amenable number.

321213023321 is a deficient number, since it is larger than the sum of its proper divisors (11076311179).

321213023321 is a wasteful number, since it uses less digits than its factorization.

321213023321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11076311178.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 321213023321 its reverse (123320312123), we get a palindrome (444533335444).

The spelling of 321213023321 in words is "three hundred twenty-one billion, two hundred thirteen million, twenty-three thousand, three hundred twenty-one".