321311213 has 8 divisors (see below), whose sum is σ = 332645400. Its totient is φ = 309994048.

The previous prime is 321311209. The next prime is 321311233. The reversal of 321311213 is 312113123.

It can be written as a sum of positive squares in 4 ways, for example, as 5822569 + 315488644 = 2413^2 + 17762^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321311213 - 2² = 321311209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321311191 and 321311200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321311233) 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, 43343 + ... + 50211.

It is an arithmetic number, because the mean of its divisors is an integer number (41580675).

Almost surely, 2^321311213 is an apocalyptic number.

It is an amenable number.

321311213 is a deficient number, since it is larger than the sum of its proper divisors (11334187).

321311213 is a wasteful number, since it uses less digits than its factorization.

321311213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8511.

The product of its digits is 108, while the sum is 17.

The square root of 321311213 is about 17925.1558710099. The cubic root of 321311213 is about 684.9233316789.

Adding to 321311213 its reverse (312113123), we get a palindrome (633424336).

The spelling of 321311213 in words is "three hundred twenty-one million, three hundred eleven thousand, two hundred thirteen".