23102921 has 2 divisors, whose sum is σ = 23102922. Its totient is φ = 23102920.

The previous prime is 23102909. The next prime is 23102923. The reversal of 23102921 is 12920132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13249600 + 9853321 = 3640^2 + 3139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23102921 is a prime.

It is a Sophie Germain prime.

Together with 23102923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23102893 and 23102902.

It is not a weakly prime, because it can be changed into another prime (23102923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11551460 + 11551461.

It is an arithmetic number, because the mean of its divisors is an integer number (11551461).

Almost surely, 2^23102921 is an apocalyptic number.

It is an amenable number.

23102921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23102921 is an equidigital number, since it uses as much as digits as its factorization.

23102921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 23102921 is about 4806.5498020930. The cubic root of 23102921 is about 284.8102604941.

The spelling of 23102921 in words is "twenty-three million, one hundred two thousand, nine hundred twenty-one".