23213215 has 4 divisors (see below), whose sum is σ = 27855864. Its totient is φ = 18570568.

The previous prime is 23213209. The next prime is 23213219. The reversal of 23213215 is 51231232.

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 23213215 - 2⁷ = 23213087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23213192 and 23213201.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321317 + ... + 2321326.

It is an arithmetic number, because the mean of its divisors is an integer number (6963966).

It is a self-describing number.

Almost surely, 2^23213215 is an apocalyptic number.

23213215 is a deficient number, since it is larger than the sum of its proper divisors (4642649).

23213215 is an equidigital number, since it uses as much as digits as its factorization.

23213215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4642648.

The product of its digits is 360, while the sum is 19.

The square root of 23213215 is about 4818.0094437433. The cubic root of 23213215 is about 285.2627719089.

Adding to 23213215 its reverse (51231232), we get a palindrome (74444447).

The spelling of 23213215 in words is "twenty-three million, two hundred thirteen thousand, two hundred fifteen".