23230021 has 6 divisors (see below), whose sum is σ = 23460710. Its totient is φ = 23001576.

The previous prime is 23229967. The next prime is 23230037. The reversal of 23230021 is 12003232.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23184225 + 45796 = 4815^2 + 214^2 .

It is not a de Polignac number, because 23230021 - 2²¹ = 21132869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23229983 and 23230010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23230061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10435 + ... + 12463.

Almost surely, 2^23230021 is an apocalyptic number.

It is an amenable number.

23230021 is a deficient number, since it is larger than the sum of its proper divisors (230689).

23230021 is an equidigital number, since it uses as much as digits as its factorization.

23230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243 (or 2136 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 23230021 is about 4819.7532094496. The cubic root of 23230021 is about 285.3315972117.

Adding to 23230021 its reverse (12003232), we get a palindrome (35233253).

The spelling of 23230021 in words is "twenty-three million, two hundred thirty thousand, twenty-one".