23616021 has 16 divisors (see below), whose sum is σ = 36993600. Its totient is φ = 13211520.

The previous prime is 23616013. The next prime is 23616029. The reversal of 23616021 is 12061632.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23616013) and next prime (23616029).

It is not a de Polignac number, because 23616021 - 2³ = 23616013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23616029) 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 15 ways as a sum of consecutive naturals, for example, 27096 + ... + 27953.

It is an arithmetic number, because the mean of its divisors is an integer number (2312100).

Almost surely, 2^23616021 is an apocalyptic number.

It is an amenable number.

23616021 is a deficient number, since it is larger than the sum of its proper divisors (13377579).

23616021 is a wasteful number, since it uses less digits than its factorization.

23616021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55076.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 23616021 is about 4859.6317761740. The cubic root of 23616021 is about 286.9033210443.

Adding to 23616021 its reverse (12061632), we get a palindrome (35677653).

The spelling of 23616021 in words is "twenty-three million, six hundred sixteen thousand, twenty-one".