23123221 has 24 divisors (see below), whose sum is σ = 26812800. Its totient is φ = 19905600.

The previous prime is 23123189. The next prime is 23123231. The reversal of 23123221 is 12232132.

23123221 = 490² + 491² + ... + 571².

It is not a de Polignac number, because 23123221 - 2⁵ = 23123189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23123195 and 23123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23123231) 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 23 ways as a sum of consecutive naturals, for example, 292660 + ... + 292738.

It is an arithmetic number, because the mean of its divisors is an integer number (1117200).

Almost surely, 2^23123221 is an apocalyptic number.

It is an amenable number.

23123221 is a deficient number, since it is larger than the sum of its proper divisors (3689579).

23123221 is a wasteful number, since it uses less digits than its factorization.

23123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 190 counting only the distinct ones).

The product of its digits is 144, while the sum is 16.

The square root of 23123221 is about 4808.6610402481. The cubic root of 23123221 is about 284.8936547933.

Adding to 23123221 its reverse (12232132), we get a palindrome (35355353).

The spelling of 23123221 in words is "twenty-three million, one hundred twenty-three thousand, two hundred twenty-one".