23240021 has 8 divisors (see below), whose sum is σ = 27958080. Its totient is φ = 18871488.

The previous prime is 23240011. The next prime is 23240029. The reversal of 23240021 is 12004232.

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

It is a cyclic number.

It is not a de Polignac number, because 23240021 - 2²² = 19045717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23239978 and 23240005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23240029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87236 + ... + 87501.

It is an arithmetic number, because the mean of its divisors is an integer number (3494760).

Almost surely, 2^23240021 is an apocalyptic number.

It is an amenable number.

23240021 is a deficient number, since it is larger than the sum of its proper divisors (4718059).

23240021 is a wasteful number, since it uses less digits than its factorization.

23240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174763.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 23240021 is about 4820.7904953441. The cubic root of 23240021 is about 285.3725342767.

Adding to 23240021 its reverse (12004232), we get a palindrome (35244253).

The spelling of 23240021 in words is "twenty-three million, two hundred forty thousand, twenty-one".