23305221 has 6 divisors (see below), whose sum is σ = 33663110. Its totient is φ = 15536808.

The previous prime is 23305201. The next prime is 23305223. The reversal of 23305221 is 12250332.

It can be written as a sum of positive squares in only one way, i.e., 17969121 + 5336100 = 4239^2 + 2310^2 .

It is not a de Polignac number, because 23305221 - 2¹¹ = 23303173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23305194 and 23305203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23305223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1294726 + ... + 1294743.

Almost surely, 2^23305221 is an apocalyptic number.

It is an amenable number.

23305221 is a deficient number, since it is larger than the sum of its proper divisors (10357889).

23305221 is a wasteful number, since it uses less digits than its factorization.

23305221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589475 (or 2589472 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 23305221 is about 4827.5481354410. The cubic root of 23305221 is about 285.6391564725.

Adding to 23305221 its reverse (12250332), we get a palindrome (35555553).

The spelling of 23305221 in words is "twenty-three million, three hundred five thousand, two hundred twenty-one".