23130221 has 4 divisors (see below), whose sum is σ = 23143392. Its totient is φ = 23117052.

The previous prime is 23130193. The next prime is 23130253. The reversal of 23130221 is 12203132.

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 a de Polignac number, because none of the positive numbers 2^k-23130221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23130196 and 23130205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23130521) 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, 3455 + ... + 7628.

It is an arithmetic number, because the mean of its divisors is an integer number (5785848).

Almost surely, 2^23130221 is an apocalyptic number.

It is an amenable number.

23130221 is a deficient number, since it is larger than the sum of its proper divisors (13171).

23130221 is a wasteful number, since it uses less digits than its factorization.

23130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13170.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 23130221 is about 4809.3888385116. The cubic root of 23130221 is about 284.9224001308.

Adding to 23130221 its reverse (12203132), we get a palindrome (35333353).

The spelling of 23130221 in words is "twenty-three million, one hundred thirty thousand, two hundred twenty-one".