23045521 has 4 divisors (see below), whose sum is σ = 23389552. Its totient is φ = 22701492.

The previous prime is 23045497. The next prime is 23045573. The reversal of 23045521 is 12554032.

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-23045521 is a prime.

It is a super-2 number, since 2×23045521² = 1062192076322882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23045492 and 23045501.

It is not an unprimeable number, because it can be changed into a prime (23045021) 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, 171915 + ... + 172048.

It is an arithmetic number, because the mean of its divisors is an integer number (5847388).

Almost surely, 2^23045521 is an apocalyptic number.

It is an amenable number.

23045521 is a deficient number, since it is larger than the sum of its proper divisors (344031).

23045521 is an equidigital number, since it uses as much as digits as its factorization.

23045521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344030.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 23045521 is about 4800.5750697182. The cubic root of 23045521 is about 284.5741912569.

Adding to 23045521 its reverse (12554032), we get a palindrome (35599553).

The spelling of 23045521 in words is "twenty-three million, forty-five thousand, five hundred twenty-one".