23213213 has 4 divisors (see below), whose sum is σ = 23438688. Its totient is φ = 22987740.

The previous prime is 23213209. The next prime is 23213219. The reversal of 23213213 is 31231232.

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 23213213 - 2² = 23213209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23213191 and 23213200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23213219) 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, 112583 + ... + 112788.

It is an arithmetic number, because the mean of its divisors is an integer number (5859672).

Almost surely, 2^23213213 is an apocalyptic number.

It is an amenable number.

23213213 is a deficient number, since it is larger than the sum of its proper divisors (225475).

23213213 is a wasteful number, since it uses less digits than its factorization.

23213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225474.

The product of its digits is 216, while the sum is 17.

The square root of 23213213 is about 4818.0092361887. The cubic root of 23213213 is about 285.2627637163.

Adding to 23213213 its reverse (31231232), we get a palindrome (54444445).

The spelling of 23213213 in words is "twenty-three million, two hundred thirteen thousand, two hundred thirteen".