23433521 has 4 divisors (see below), whose sum is σ = 23443572. Its totient is φ = 23423472.

The previous prime is 23433503. The next prime is 23433523. The reversal of 23433521 is 12533432.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19044496 + 4389025 = 4364^2 + 2095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23433521 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 (23433523) 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, 491 + ... + 6863.

It is an arithmetic number, because the mean of its divisors is an integer number (5860893).

Almost surely, 2^23433521 is an apocalyptic number.

It is an amenable number.

23433521 is a deficient number, since it is larger than the sum of its proper divisors (10051).

23433521 is an equidigital number, since it uses as much as digits as its factorization.

23433521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10050.

The product of its digits is 2160, while the sum is 23.

The square root of 23433521 is about 4840.8182159631. The cubic root of 23433521 is about 286.1623648134.

Adding to 23433521 its reverse (12533432), we get a palindrome (35966953).

The spelling of 23433521 in words is "twenty-three million, four hundred thirty-three thousand, five hundred twenty-one".