23257021 has 2 divisors, whose sum is σ = 23257022. Its totient is φ = 23257020.

The previous prime is 23257009. The next prime is 23257027. The reversal of 23257021 is 12075232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 4020025 = 4386^2 + 2005^2 .

It is a cyclic number.

It is not a de Polignac number, because 23257021 - 2¹³ = 23248829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23256983 and 23257001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23257027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11628510 + 11628511.

It is an arithmetic number, because the mean of its divisors is an integer number (11628511).

Almost surely, 2^23257021 is an apocalyptic number.

It is an amenable number.

23257021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23257021 is an equidigital number, since it uses as much as digits as its factorization.

23257021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 23257021 is about 4822.5533693263. The cubic root of 23257021 is about 285.4421003448.

The spelling of 23257021 in words is "twenty-three million, two hundred fifty-seven thousand, twenty-one".