23161321 has 4 divisors (see below), whose sum is σ = 23173200. Its totient is φ = 23149444.

The previous prime is 23161319. The next prime is 23161331. The reversal of 23161321 is 12316132.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23161321 - 2¹ = 23161319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23161331) 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, 2251 + ... + 7168.

It is an arithmetic number, because the mean of its divisors is an integer number (5793300).

Almost surely, 2^23161321 is an apocalyptic number.

It is an amenable number.

23161321 is a deficient number, since it is larger than the sum of its proper divisors (11879).

23161321 is an equidigital number, since it uses as much as digits as its factorization.

23161321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11878.

The product of its digits is 216, while the sum is 19.

The square root of 23161321 is about 4812.6210114656. The cubic root of 23161321 is about 285.0500414849.

Adding to 23161321 its reverse (12316132), we get a palindrome (35477453).

The spelling of 23161321 in words is "twenty-three million, one hundred sixty-one thousand, three hundred twenty-one".