213131110321 has 4 divisors (see below), whose sum is σ = 224348537200. Its totient is φ = 201913683444.

The previous prime is 213131110301. The next prime is 213131110327. The reversal of 213131110321 is 123011131312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213131110321 - 2²¹ = 213129013169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 11217426859 = 213131110321 / (2 + 1 + 3 + 1 + 3 + 1 + 1 + 1 + 0 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213131110327) 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, 5608713411 + ... + 5608713448.

It is an arithmetic number, because the mean of its divisors is an integer number (56087134300).

Almost surely, 2^213131110321 is an apocalyptic number.

It is an amenable number.

213131110321 is a deficient number, since it is larger than the sum of its proper divisors (11217426879).

213131110321 is a wasteful number, since it uses less digits than its factorization.

213131110321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11217426878.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 213131110321 its reverse (123011131312), we get a palindrome (336142241633).

The spelling of 213131110321 in words is "two hundred thirteen billion, one hundred thirty-one million, one hundred ten thousand, three hundred twenty-one".