23331221 has 8 divisors (see below), whose sum is σ = 24622080. Its totient is φ = 22046688.

The previous prime is 23331199. The next prime is 23331229. The reversal of 23331221 is 12213332.

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

It is a de Polignac number, because none of the positive numbers 2^k-23331221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23331221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23331229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7340 + ... + 10026.

It is an arithmetic number, because the mean of its divisors is an integer number (3077760).

Almost surely, 2^23331221 is an apocalyptic number.

It is an amenable number.

23331221 is a deficient number, since it is larger than the sum of its proper divisors (1290859).

23331221 is a wasteful number, since it uses less digits than its factorization.

23331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163.

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

The square root of 23331221 is about 4830.2402631753. The cubic root of 23331221 is about 285.7453395175.

Adding to 23331221 its reverse (12213332), we get a palindrome (35544553).

The spelling of 23331221 in words is "twenty-three million, three hundred thirty-one thousand, two hundred twenty-one".