23031021 has 16 divisors (see below), whose sum is σ = 34811840. Its totient is φ = 13426560.

The previous prime is 23030999. The next prime is 23031061. The reversal of 23031021 is 12013032.

It is a happy number.

It is not a de Polignac number, because 23031021 - 2⁶ = 23030957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23030988 and 23031006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23031061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14800 + ... + 16281.

It is an arithmetic number, because the mean of its divisors is an integer number (2175740).

Almost surely, 2^23031021 is an apocalyptic number.

It is an amenable number.

23031021 is a deficient number, since it is larger than the sum of its proper divisors (11780819).

23031021 is a wasteful number, since it uses less digits than its factorization.

23031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31116.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 23031021 is about 4799.0645963563. The cubic root of 23031021 is about 284.5144950367.

Adding to 23031021 its reverse (12013032), we get a palindrome (35044053).

The spelling of 23031021 in words is "twenty-three million, thirty-one thousand, twenty-one".