23147321 has 2 divisors, whose sum is σ = 23147322. Its totient is φ = 23147320.

The previous prime is 23147317. The next prime is 23147323. The reversal of 23147321 is 12374132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23145721 + 1600 = 4811^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 23147321 - 2² = 23147317 is a prime.

Together with 23147323, 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 (23147323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11573660 + 11573661.

It is an arithmetic number, because the mean of its divisors is an integer number (11573661).

Almost surely, 2^23147321 is an apocalyptic number.

It is an amenable number.

23147321 is a deficient number, since it is larger than the sum of its proper divisors (1).

23147321 is an equidigital number, since it uses as much as digits as its factorization.

23147321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 23.

The square root of 23147321 is about 4811.1662827219. The cubic root of 23147321 is about 284.9925965041.

The spelling of 23147321 in words is "twenty-three million, one hundred forty-seven thousand, three hundred twenty-one".