23228921 has 2 divisors, whose sum is σ = 23228922. Its totient is φ = 23228920.

The previous prime is 23228899. The next prime is 23228927. The reversal of 23228921 is 12982232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12503296 + 10725625 = 3536^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 23228921 - 2¹⁴ = 23212537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (23228927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11614460 + 11614461.

It is an arithmetic number, because the mean of its divisors is an integer number (11614461).

Almost surely, 2^23228921 is an apocalyptic number.

It is an amenable number.

23228921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23228921 is an equidigital number, since it uses as much as digits as its factorization.

23228921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 23228921 is about 4819.6390943721. The cubic root of 23228921 is about 285.3270934173.

The spelling of 23228921 in words is "twenty-three million, two hundred twenty-eight thousand, nine hundred twenty-one".