23153221 has 32 divisors (see below), whose sum is σ = 29942528. Its totient is φ = 17418240.

The previous prime is 23153197. The next prime is 23153293. The reversal of 23153221 is 12235132.

It is not a de Polignac number, because 23153221 - 2⁵ = 23153189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23153321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 238645 + ... + 238741.

It is an arithmetic number, because the mean of its divisors is an integer number (935704).

It is a self-describing number.

Almost surely, 2^23153221 is an apocalyptic number.

It is an amenable number.

23153221 is a deficient number, since it is larger than the sum of its proper divisors (6789307).

23153221 is a wasteful number, since it uses less digits than its factorization.

23153221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221.

The product of its digits is 360, while the sum is 19.

The square root of 23153221 is about 4811.7794005960. The cubic root of 23153221 is about 285.0168082833.

Adding to 23153221 its reverse (12235132), we get a palindrome (35388353).

The spelling of 23153221 in words is "twenty-three million, one hundred fifty-three thousand, two hundred twenty-one".