23163221 has 4 divisors (see below), whose sum is σ = 23789292. Its totient is φ = 22537152.

The previous prime is 23163209. The next prime is 23163241. The reversal of 23163221 is 12236132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17522596 + 5640625 = 4186^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 23163221 - 2⁶ = 23163157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23163193 and 23163202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23163241) 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, 312980 + ... + 313053.

It is an arithmetic number, because the mean of its divisors is an integer number (5947323).

It is a self-describing number.

Almost surely, 2^23163221 is an apocalyptic number.

It is an amenable number.

23163221 is a deficient number, since it is larger than the sum of its proper divisors (626071).

23163221 is an equidigital number, since it uses as much as digits as its factorization.

23163221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626070.

The product of its digits is 432, while the sum is 20.

The square root of 23163221 is about 4812.8184050512. The cubic root of 23163221 is about 285.0578358053.

Adding to 23163221 its reverse (12236132), we get a palindrome (35399353).

The spelling of 23163221 in words is "twenty-three million, one hundred sixty-three thousand, two hundred twenty-one".