23221331 has 8 divisors (see below), whose sum is σ = 26913024. Its totient is φ = 19623240.

The previous prime is 23221327. The next prime is 23221349. The reversal of 23221331 is 13312232.

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

It is not a de Polignac number, because 23221331 - 2² = 23221327 is a prime.

It is a super-2 number, since 2×23221331² = 1078460426823122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23221301) 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, 22865 + ... + 23858.

It is an arithmetic number, because the mean of its divisors is an integer number (3364128).

Almost surely, 2^23221331 is an apocalyptic number.

23221331 is a deficient number, since it is larger than the sum of its proper divisors (3691693).

23221331 is an equidigital number, since it uses as much as digits as its factorization.

23221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46801.

The product of its digits is 216, while the sum is 17.

The square root of 23221331 is about 4818.8516266845. The cubic root of 23221331 is about 285.2960133605.

Adding to 23221331 its reverse (13312232), we get a palindrome (36533563).

Subtracting from 23221331 its reverse (13312232), we obtain a palindrome (9909099).

The spelling of 23221331 in words is "twenty-three million, two hundred twenty-one thousand, three hundred thirty-one".