23911921 has 8 divisors (see below), whose sum is σ = 26985600. Its totient is φ = 20988240.

The previous prime is 23911919. The next prime is 23911963. The reversal of 23911921 is 12911932.

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 23911921 - 2¹ = 23911919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23911921.

It is not an unprimeable number, because it can be changed into a prime (23911981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37161 + ... + 37798.

It is an arithmetic number, because the mean of its divisors is an integer number (3373200).

Almost surely, 2^23911921 is an apocalyptic number.

It is an amenable number.

23911921 is a deficient number, since it is larger than the sum of its proper divisors (3073679).

23911921 is a wasteful number, since it uses less digits than its factorization.

23911921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74999.

The product of its digits is 972, while the sum is 28.

The square root of 23911921 is about 4889.9816973073. The cubic root of 23911921 is about 288.0966151223.

The spelling of 23911921 in words is "twenty-three million, nine hundred eleven thousand, nine hundred twenty-one".