23173221 has 8 divisors (see below), whose sum is σ = 31087840. Its totient is φ = 15353712.

The previous prime is 23173181. The next prime is 23173231. The reversal of 23173221 is 12237132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23173221 - 2⁷ = 23173093 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 (23173231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23206 + ... + 24183.

It is an arithmetic number, because the mean of its divisors is an integer number (3885980).

It is a self-describing number.

Almost surely, 2^23173221 is an apocalyptic number.

It is an amenable number.

23173221 is a deficient number, since it is larger than the sum of its proper divisors (7914619).

23173221 is a wasteful number, since it uses less digits than its factorization.

23173221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47555.

The product of its digits is 504, while the sum is 21.

The square root of 23173221 is about 4813.8571852518. The cubic root of 23173221 is about 285.0988515207.

The spelling of 23173221 in words is "twenty-three million, one hundred seventy-three thousand, two hundred twenty-one".