23021 has 2 divisors, whose sum is σ = 23022. Its totient is φ = 23020.

The previous prime is 23017. The next prime is 23027. The reversal of 23021 is 12032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15625 + 7396 = 125^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 23021 - 2² = 23017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11510 + 11511.

It is an arithmetic number, because the mean of its divisors is an integer number (11511).

2²³⁰²¹ is an apocalyptic number.

It is an amenable number.

23021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23021 is an equidigital number, since it uses as much as digits as its factorization.

23021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 23021 is about 151.7267280343. The cubic root of 23021 is about 28.4473224130.

Adding to 23021 its reverse (12032), we get a palindrome (35053).

The spelling of 23021 in words is "twenty-three thousand, twenty-one", and thus it is an iban number.