23636221 has 4 divisors (see below), whose sum is σ = 27012832. Its totient is φ = 20259612.

The previous prime is 23636183. The next prime is 23636227. The reversal of 23636221 is 12263632.

It is a happy number.

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 not a de Polignac number, because 23636221 - 2⁹ = 23635709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23636227) 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, 1688295 + ... + 1688308.

It is an arithmetic number, because the mean of its divisors is an integer number (6753208).

Almost surely, 2^23636221 is an apocalyptic number.

It is an amenable number.

23636221 is a deficient number, since it is larger than the sum of its proper divisors (3376611).

23636221 is an equidigital number, since it uses as much as digits as its factorization.

23636221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376610.

The product of its digits is 2592, while the sum is 25.

The square root of 23636221 is about 4861.7096787036. The cubic root of 23636221 is about 286.9850987986.

Adding to 23636221 its reverse (12263632), we get a palindrome (35899853).

The spelling of 23636221 in words is "twenty-three million, six hundred thirty-six thousand, two hundred twenty-one".