23021389 has 4 divisors (see below), whose sum is σ = 23815260. Its totient is φ = 22227520.

The previous prime is 23021359. The next prime is 23021393. The reversal of 23021389 is 98312032.

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 4272489 + 18748900 = 2067^2 + 4330^2 .

It is a cyclic number.

It is not a de Polignac number, because 23021389 - 2⁵ = 23021357 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 (23021359) 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, 396892 + ... + 396949.

It is an arithmetic number, because the mean of its divisors is an integer number (5953815).

Almost surely, 2^23021389 is an apocalyptic number.

23021389 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

23021389 is a deficient number, since it is larger than the sum of its proper divisors (793871).

23021389 is an equidigital number, since it uses as much as digits as its factorization.

23021389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793870.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 23021389 is about 4798.0609625139. The cubic root of 23021389 is about 284.4748264271.

The spelling of 23021389 in words is "twenty-three million, twenty-one thousand, three hundred eighty-nine".