23506221 has 4 divisors (see below), whose sum is σ = 31341632. Its totient is φ = 15670812.

The previous prime is 23506201. The next prime is 23506229. The reversal of 23506221 is 12260532.

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 not a de Polignac number, because 23506221 - 2⁹ = 23505709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23506229) 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, 3917701 + ... + 3917706.

It is an arithmetic number, because the mean of its divisors is an integer number (7835408).

Almost surely, 2^23506221 is an apocalyptic number.

It is an amenable number.

23506221 is a deficient number, since it is larger than the sum of its proper divisors (7835411).

23506221 is an equidigital number, since it uses as much as digits as its factorization.

23506221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7835410.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 23506221 is about 4848.3214621145. The cubic root of 23506221 is about 286.4579887170.

Adding to 23506221 its reverse (12260532), we get a palindrome (35766753).

The spelling of 23506221 in words is "twenty-three million, five hundred six thousand, two hundred twenty-one".