321220203213 has 64 divisors (see below), whose sum is σ = 529708032000. Its totient is φ = 168607941120.

The previous prime is 321220203133. The next prime is 321220203251. The reversal of 321220203213 is 312302022123.

It is a happy number.

321220203213 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 321220203213 - 2⁸ = 321220202957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 321220203213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321220203013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77606098 + ... + 77610236.

It is an arithmetic number, because the mean of its divisors is an integer number (8276688000).

Almost surely, 2^321220203213 is an apocalyptic number.

It is an amenable number.

321220203213 is a deficient number, since it is larger than the sum of its proper divisors (208487828787).

321220203213 is a wasteful number, since it uses less digits than its factorization.

321220203213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5482.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 321220203213 its reverse (312302022123), we get a palindrome (633522225336).

The spelling of 321220203213 in words is "three hundred twenty-one billion, two hundred twenty million, two hundred three thousand, two hundred thirteen".