23668921 has 2 divisors, whose sum is σ = 23668922. Its totient is φ = 23668920.

The previous prime is 23668919. The next prime is 23668933. The reversal of 23668921 is 12986632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14907321 + 8761600 = 3861^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 23668921 - 2¹ = 23668919 is a prime.

Together with 23668919, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23668951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11834460 + 11834461.

It is an arithmetic number, because the mean of its divisors is an integer number (11834461).

Almost surely, 2^23668921 is an apocalyptic number.

It is an amenable number.

23668921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23668921 is an equidigital number, since it uses as much as digits as its factorization.

23668921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 23668921 is about 4865.0715308205. The cubic root of 23668921 is about 287.1173828944.

The spelling of 23668921 in words is "twenty-three million, six hundred sixty-eight thousand, nine hundred twenty-one".