23156213 has 4 divisors (see below), whose sum is σ = 23218668. Its totient is φ = 23093760.

The previous prime is 23156209. The next prime is 23156219. The reversal of 23156213 is 31265132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5373124 + 17783089 = 2318^2 + 4217^2 .

It is a cyclic number.

It is not a de Polignac number, because 23156213 - 2² = 23156209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23156219) 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, 30668 + ... + 31413.

It is an arithmetic number, because the mean of its divisors is an integer number (5804667).

Almost surely, 2^23156213 is an apocalyptic number.

It is an amenable number.

23156213 is a deficient number, since it is larger than the sum of its proper divisors (62455).

23156213 is an equidigital number, since it uses as much as digits as its factorization.

23156213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62454.

The product of its digits is 1080, while the sum is 23.

The square root of 23156213 is about 4812.0902942484. The cubic root of 23156213 is about 285.0290849562.

The spelling of 23156213 in words is "twenty-three million, one hundred fifty-six thousand, two hundred thirteen".