23112521 has 4 divisors (see below), whose sum is σ = 23457552. Its totient is φ = 22767492.

The previous prime is 23112511. The next prime is 23112527. The reversal of 23112521 is 12521132.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-23112521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23112521.

It is not an unprimeable number, because it can be changed into a prime (23112527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172415 + ... + 172548.

It is an arithmetic number, because the mean of its divisors is an integer number (5864388).

Almost surely, 2^23112521 is an apocalyptic number.

It is an amenable number.

23112521 is a deficient number, since it is larger than the sum of its proper divisors (345031).

23112521 is an equidigital number, since it uses as much as digits as its factorization.

23112521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345030.

The product of its digits is 120, while the sum is 17.

The square root of 23112521 is about 4807.5483356904. The cubic root of 23112521 is about 284.8497042781.

Adding to 23112521 its reverse (12521132), we get a palindrome (35633653).

The spelling of 23112521 in words is "twenty-three million, one hundred twelve thousand, five hundred twenty-one".