23916221 has 16 divisors (see below), whose sum is σ = 28385280. Its totient is φ = 19718640.

The previous prime is 23916203. The next prime is 23916247. The reversal of 23916221 is 12261932.

It is a cyclic number.

It is not a de Polignac number, because 23916221 - 2⁶ = 23916157 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23916121) 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, 66440 + ... + 66798.

It is an arithmetic number, because the mean of its divisors is an integer number (1774080).

Almost surely, 2^23916221 is an apocalyptic number.

It is an amenable number.

23916221 is a deficient number, since it is larger than the sum of its proper divisors (4469059).

23916221 is a wasteful number, since it uses less digits than its factorization.

23916221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704.

The product of its digits is 1296, while the sum is 26.

The square root of 23916221 is about 4890.4213519900. The cubic root of 23916221 is about 288.1138832343.

The spelling of 23916221 in words is "twenty-three million, nine hundred sixteen thousand, two hundred twenty-one".