213305204231 has 4 divisors (see below), whose sum is σ = 243777376272. Its totient is φ = 182833032192.

The previous prime is 213305204213. The next prime is 213305204249. The reversal of 213305204231 is 132402503312.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (213305204213) and next prime (213305204249).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213305204231 is a prime.

It is a super-2 number, since 2×213305204231² (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 213305204231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213305204531) 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, 15236086010 + ... + 15236086023.

It is an arithmetic number, because the mean of its divisors is an integer number (60944344068).

Almost surely, 2^213305204231 is an apocalyptic number.

213305204231 is a deficient number, since it is larger than the sum of its proper divisors (30472172041).

213305204231 is an equidigital number, since it uses as much as digits as its factorization.

213305204231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30472172040.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 213305204231 its reverse (132402503312), we get a palindrome (345707707543).

The spelling of 213305204231 in words is "two hundred thirteen billion, three hundred five million, two hundred four thousand, two hundred thirty-one".