213111233 has 4 divisors (see below), whose sum is σ = 213597120. Its totient is φ = 212625348.

The previous prime is 213111229. The next prime is 213111259. The reversal of 213111233 is 332111312.

213111233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 213111233 - 2² = 213111229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213111203) 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, 242285 + ... + 243162.

It is an arithmetic number, because the mean of its divisors is an integer number (53399280).

Almost surely, 2^213111233 is an apocalyptic number.

It is an amenable number.

213111233 is a deficient number, since it is larger than the sum of its proper divisors (485887).

213111233 is an equidigital number, since it uses as much as digits as its factorization.

213111233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485886.

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

The square root of 213111233 is about 14598.3298017273. The cubic root of 213111233 is about 597.3132022293.

Adding to 213111233 its reverse (332111312), we get a palindrome (545222545).

The spelling of 213111233 in words is "two hundred thirteen million, one hundred eleven thousand, two hundred thirty-three".