23170321 has 4 divisors (see below), whose sum is σ = 23221044. Its totient is φ = 23119600.

The previous prime is 23170319. The next prime is 23170339. The reversal of 23170321 is 12307132.

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 5856400 + 17313921 = 2420^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 23170321 - 2¹ = 23170319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23173321) 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, 24670 + ... + 25591.

It is an arithmetic number, because the mean of its divisors is an integer number (5805261).

Almost surely, 2^23170321 is an apocalyptic number.

It is an amenable number.

23170321 is a deficient number, since it is larger than the sum of its proper divisors (50723).

23170321 is an equidigital number, since it uses as much as digits as its factorization.

23170321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50722.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 23170321 is about 4813.5559620721. Note that the first 3 decimals coincide. The cubic root of 23170321 is about 285.0869581782.

Adding to 23170321 its reverse (12307132), we get a palindrome (35477453).

The spelling of 23170321 in words is "twenty-three million, one hundred seventy thousand, three hundred twenty-one".