23310021 has 16 divisors (see below), whose sum is σ = 35760128. Its totient is φ = 13230000.

The previous prime is 23310011. The next prime is 23310041. The reversal of 23310021 is 12001332.

It is a happy number.

It is not a de Polignac number, because 23310021 - 2⁵ = 23309989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23309979 and 23310006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23310011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505 + ... + 6846.

It is an arithmetic number, because the mean of its divisors is an integer number (2235008).

Almost surely, 2^23310021 is an apocalyptic number.

23310021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23310021 is a deficient number, since it is larger than the sum of its proper divisors (12450107).

23310021 is a wasteful number, since it uses less digits than its factorization.

23310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7512.

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

The square root of 23310021 is about 4828.0452566230. The cubic root of 23310021 is about 285.6587654381.

Adding to 23310021 its reverse (12001332), we get a palindrome (35311353).

The spelling of 23310021 in words is "twenty-three million, three hundred ten thousand, twenty-one".