23117021 has 2 divisors, whose sum is σ = 23117022. Its totient is φ = 23117020.

The previous prime is 23117009. The next prime is 23117023. The reversal of 23117021 is 12071132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17757796 + 5359225 = 4214^2 + 2315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23117021 is a prime.

Together with 23117023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23117023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11558510 + 11558511.

It is an arithmetic number, because the mean of its divisors is an integer number (11558511).

Almost surely, 2^23117021 is an apocalyptic number.

It is an amenable number.

23117021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23117021 is an equidigital number, since it uses as much as digits as its factorization.

23117021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 23117021 is about 4808.0163269274. The cubic root of 23117021 is about 284.8681897921.

Adding to 23117021 its reverse (12071132), we get a palindrome (35188153).

The spelling of 23117021 in words is "twenty-three million, one hundred seventeen thousand, twenty-one".