213321322331 has 4 divisors (see below), whose sum is σ = 229730654832. Its totient is φ = 196911989832.

The previous prime is 213321322307. The next prime is 213321322351. The reversal of 213321322331 is 133223123312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213321322331 is a prime.

It is a super-2 number, since 2×213321322331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213321322331.

It is not an unprimeable number, because it can be changed into a prime (213321322351) 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, 8204666231 + ... + 8204666256.

It is an arithmetic number, because the mean of its divisors is an integer number (57432663708).

Almost surely, 2^213321322331 is an apocalyptic number.

213321322331 is a deficient number, since it is larger than the sum of its proper divisors (16409332501).

213321322331 is a wasteful number, since it uses less digits than its factorization.

213321322331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16409332500.

The product of its digits is 3888, while the sum is 26.

Adding to 213321322331 its reverse (133223123312), we get a palindrome (346544445643).

The spelling of 213321322331 in words is "two hundred thirteen billion, three hundred twenty-one million, three hundred twenty-two thousand, three hundred thirty-one".