23230721 has 8 divisors (see below), whose sum is σ = 24643080. Its totient is φ = 21823488.

The previous prime is 23230693. The next prime is 23230747. The reversal of 23230721 is 12703232.

It can be written as a sum of positive squares in 4 ways, for example, as 5125696 + 18105025 = 2264^2 + 4255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23230721 - 2⁶ = 23230657 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23230693 and 23230702.

It is not an unprimeable number, because it can be changed into a prime (23230771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12185 + ... + 13961.

It is an arithmetic number, because the mean of its divisors is an integer number (3080385).

Almost surely, 2^23230721 is an apocalyptic number.

It is an amenable number.

23230721 is a deficient number, since it is larger than the sum of its proper divisors (1412359).

23230721 is a wasteful number, since it uses less digits than its factorization.

23230721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 23230721 is about 4819.8258267286. The cubic root of 23230721 is about 285.3344631886.

Adding to 23230721 its reverse (12703232), we get a palindrome (35933953).

The spelling of 23230721 in words is "twenty-three million, two hundred thirty thousand, seven hundred twenty-one".