213305231 has 8 divisors (see below), whose sum is σ = 219575664. Its totient is φ = 207118080.

The previous prime is 213305221. The next prime is 213305251. The reversal of 213305231 is 132503312.

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 213305231 - 2¹⁰ = 213304207 is a prime.

It is a super-2 number, since 2×213305231² = 90998243143926722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213305201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15605 + ... + 25886.

It is an arithmetic number, because the mean of its divisors is an integer number (27446958).

Almost surely, 2^213305231 is an apocalyptic number.

213305231 is a deficient number, since it is larger than the sum of its proper divisors (6270433).

213305231 is an equidigital number, since it uses as much as digits as its factorization.

213305231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41641.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 213305231 is about 14604.9728175029. The cubic root of 213305231 is about 597.4943946534.

Adding to 213305231 its reverse (132503312), we get a palindrome (345808543).

The spelling of 213305231 in words is "two hundred thirteen million, three hundred five thousand, two hundred thirty-one".