23021309 has 4 divisors (see below), whose sum is σ = 23173920. Its totient is φ = 22868700.

The previous prime is 23021291. The next prime is 23021333. The reversal of 23021309 is 90312032.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23021309 - 2²⁰ = 21972733 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76079 + ... + 76380.

It is an arithmetic number, because the mean of its divisors is an integer number (5793480).

Almost surely, 2^23021309 is an apocalyptic number.

It is an amenable number.

23021309 is a deficient number, since it is larger than the sum of its proper divisors (152611).

23021309 is a wasteful number, since it uses less digits than its factorization.

23021309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152610.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 23021309 is about 4798.0526258056. The cubic root of 23021309 is about 284.4744969073.

The spelling of 23021309 in words is "twenty-three million, twenty-one thousand, three hundred nine".