213311231 has 8 divisors (see below), whose sum is σ = 245421600. Its totient is φ = 181610208.

The previous prime is 213311221. The next prime is 213311311. The reversal of 213311231 is 132113312.

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 213311231 - 2¹⁸ = 213049087 is a prime.

It is a super-2 number, since 2×213311231² = 91003362541470722, 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 (213311201) 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, 101216 + ... + 103301.

It is an arithmetic number, because the mean of its divisors is an integer number (30677700).

Almost surely, 2^213311231 is an apocalyptic number.

213311231 is a deficient number, since it is larger than the sum of its proper divisors (32110369).

213311231 is a wasteful number, since it uses less digits than its factorization.

213311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204673.

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

The square root of 213311231 is about 14605.1782255473. The cubic root of 213311231 is about 597.4999968488.

Adding to 213311231 its reverse (132113312), we get a palindrome (345424543).

The spelling of 213311231 in words is "two hundred thirteen million, three hundred eleven thousand, two hundred thirty-one".