213112231 has 4 divisors (see below), whose sum is σ = 214419832. Its totient is φ = 211804632.

The previous prime is 213112177. The next prime is 213112247. The reversal of 213112231 is 132211312.

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

It is a cyclic number.

It is not a de Polignac number, because 213112231 - 2⁷ = 213112103 is a prime.

It is a super-2 number, since 2×213112231² = 90833646003594722, 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 (213112831) 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 3 ways as a sum of consecutive naturals, for example, 653556 + ... + 653881.

It is an arithmetic number, because the mean of its divisors is an integer number (53604958).

Almost surely, 2^213112231 is an apocalyptic number.

213112231 is a deficient number, since it is larger than the sum of its proper divisors (1307601).

213112231 is a wasteful number, since it uses less digits than its factorization.

213112231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307600.

The product of its digits is 72, while the sum is 16.

The square root of 213112231 is about 14598.3639836798. The cubic root of 213112231 is about 597.3141346338.

Adding to 213112231 its reverse (132211312), we get a palindrome (345323543).

The spelling of 213112231 in words is "two hundred thirteen million, one hundred twelve thousand, two hundred thirty-one".