23280521 has 8 divisors (see below), whose sum is σ = 25608288. Its totient is φ = 21162900.

The previous prime is 23280487. The next prime is 23280539. The reversal of 23280521 is 12508232.

It is not a de Polignac number, because 23280521 - 2²² = 19086217 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 (23280541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7415 + ... + 10076.

It is an arithmetic number, because the mean of its divisors is an integer number (3201036).

Almost surely, 2^23280521 is an apocalyptic number.

It is an amenable number.

23280521 is a deficient number, since it is larger than the sum of its proper divisors (2327767).

23280521 is an equidigital number, since it uses as much as digits as its factorization.

23280521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17524 (or 17502 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 23280521 is about 4824.9892227859. The cubic root of 23280521 is about 285.5382094051.

Adding to 23280521 its reverse (12508232), we get a palindrome (35788753).

The spelling of 23280521 in words is "twenty-three million, two hundred eighty thousand, five hundred twenty-one".