23121089 has 4 divisors (see below), whose sum is σ = 23685060. Its totient is φ = 22557120.

The previous prime is 23121073. The next prime is 23121101. The reversal of 23121089 is 98012132.

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 984064 + 22137025 = 992^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121089 - 2⁴ = 23121073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23121389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281924 + ... + 282005.

It is an arithmetic number, because the mean of its divisors is an integer number (5921265).

Almost surely, 2^23121089 is an apocalyptic number.

It is an amenable number.

23121089 is a deficient number, since it is larger than the sum of its proper divisors (563971).

23121089 is an equidigital number, since it uses as much as digits as its factorization.

23121089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563970.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 23121089 is about 4808.4393518064. The cubic root of 23121089 is about 284.8848986322.

The spelling of 23121089 in words is "twenty-three million, one hundred twenty-one thousand, eighty-nine".