23357221 has 2 divisors, whose sum is σ = 23357222. Its totient is φ = 23357220.

The previous prime is 23357203. The next prime is 23357233. The reversal of 23357221 is 12275332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16524225 + 6832996 = 4065^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 23357221 - 2⁵ = 23357189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23357281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11678610 + 11678611.

It is an arithmetic number, because the mean of its divisors is an integer number (11678611).

Almost surely, 2^23357221 is an apocalyptic number.

It is an amenable number.

23357221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23357221 is an equidigital number, since it uses as much as digits as its factorization.

23357221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 25.

The square root of 23357221 is about 4832.9308912915. The cubic root of 23357221 is about 285.8514437059.

The spelling of 23357221 in words is "twenty-three million, three hundred fifty-seven thousand, two hundred twenty-one".