23340021 has 4 divisors (see below), whose sum is σ = 31120032. Its totient is φ = 15560012.

The previous prime is 23340019. The next prime is 23340047. The reversal of 23340021 is 12004332.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23340021 - 2¹ = 23340019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23340001) 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 3 ways as a sum of consecutive naturals, for example, 3890001 + ... + 3890006.

It is an arithmetic number, because the mean of its divisors is an integer number (7780008).

Almost surely, 2^23340021 is an apocalyptic number.

It is an amenable number.

23340021 is a deficient number, since it is larger than the sum of its proper divisors (7780011).

23340021 is an equidigital number, since it uses as much as digits as its factorization.

23340021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7780010.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 23340021 is about 4831.1511050680. The cubic root of 23340021 is about 285.7812605253.

Adding to 23340021 its reverse (12004332), we get a palindrome (35344353).

The spelling of 23340021 in words is "twenty-three million, three hundred forty thousand, twenty-one".