23153021 has 4 divisors (see below), whose sum is σ = 23182044. Its totient is φ = 23124000.

The previous prime is 23152951. The next prime is 23153023. The reversal of 23153021 is 12035132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10797796 + 12355225 = 3286^2 + 3515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23153021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23153023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13280 + ... + 14921.

It is an arithmetic number, because the mean of its divisors is an integer number (5795511).

Almost surely, 2^23153021 is an apocalyptic number.

It is an amenable number.

23153021 is a deficient number, since it is larger than the sum of its proper divisors (29023).

23153021 is an equidigital number, since it uses as much as digits as its factorization.

23153021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29022.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 23153021 is about 4811.7586182185. The cubic root of 23153021 is about 285.0159876124.

Adding to 23153021 its reverse (12035132), we get a palindrome (35188153).

The spelling of 23153021 in words is "twenty-three million, one hundred fifty-three thousand, twenty-one".