23245521 has 16 divisors (see below), whose sum is σ = 33472320. Its totient is φ = 14264640.

The previous prime is 23245517. The next prime is 23245529. The reversal of 23245521 is 12554232.

It is not a de Polignac number, because 23245521 - 2² = 23245517 is a prime.

It is a super-2 number, since 2×23245521² = 1080708493122882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23245491 and 23245500.

It is not an unprimeable number, because it can be changed into a prime (23245529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19266 + ... + 20436.

It is an arithmetic number, because the mean of its divisors is an integer number (2092020).

Almost surely, 2^23245521 is an apocalyptic number.

It is an amenable number.

23245521 is a deficient number, since it is larger than the sum of its proper divisors (10226799).

23245521 is a wasteful number, since it uses less digits than its factorization.

23245521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696.

The product of its digits is 2400, while the sum is 24.

The square root of 23245521 is about 4821.3609074617. The cubic root of 23245521 is about 285.3950446571.

Adding to 23245521 its reverse (12554232), we get a palindrome (35799753).

It can be divided in two parts, 232 and 45521, that added together give a triangular number (45753 = T₃₀₂).

The spelling of 23245521 in words is "twenty-three million, two hundred forty-five thousand, five hundred twenty-one".