321123220213 has 4 divisors (see below), whose sum is σ = 340012821420. Its totient is φ = 302233619008.

The previous prime is 321123220193. The next prime is 321123220277. The reversal of 321123220213 is 312022321123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271125365809 + 49997854404 = 520697^2 + 223602^2 .

It is a cyclic number.

It is not a de Polignac number, because 321123220213 - 2⁹ = 321123219701 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 (321123227213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9444800578 + ... + 9444800611.

It is an arithmetic number, because the mean of its divisors is an integer number (85003205355).

Almost surely, 2^321123220213 is an apocalyptic number.

It is an amenable number.

321123220213 is a deficient number, since it is larger than the sum of its proper divisors (18889601207).

321123220213 is a wasteful number, since it uses less digits than its factorization.

321123220213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18889601206.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 321123220213 its reverse (312022321123), we get a palindrome (633145541336).

The spelling of 321123220213 in words is "three hundred twenty-one billion, one hundred twenty-three million, two hundred twenty thousand, two hundred thirteen".