23021139 has 4 divisors (see below), whose sum is σ = 30694856. Its totient is φ = 15347424.

The previous prime is 23021101. The next prime is 23021147. The reversal of 23021139 is 93112032.

It is a happy number.

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

It is not a de Polignac number, because 23021139 - 2⁸ = 23020883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23021149) 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, 3836854 + ... + 3836859.

It is an arithmetic number, because the mean of its divisors is an integer number (7673714).

Almost surely, 2^23021139 is an apocalyptic number.

23021139 is a deficient number, since it is larger than the sum of its proper divisors (7673717).

23021139 is an equidigital number, since it uses as much as digits as its factorization.

23021139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7673716.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 23021139 is about 4798.0349102523. The cubic root of 23021139 is about 284.4737966751.

The spelling of 23021139 in words is "twenty-three million, twenty-one thousand, one hundred thirty-nine".