23304721 has 6 divisors (see below), whose sum is σ = 25616066. Its totient is φ = 21186000.

The previous prime is 23304713. The next prime is 23304733. The reversal of 23304721 is 12740332.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 7623121 = 3960^2 + 2761^2 .

It is not a de Polignac number, because 23304721 - 2³ = 23304713 is a prime.

It is a super-2 number, since 2×23304721² = 1086220041775682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23304692 and 23304701.

It is not an unprimeable number, because it can be changed into a prime (23304751) 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, 96180 + ... + 96421.

Almost surely, 2^23304721 is an apocalyptic number.

It is an amenable number.

23304721 is a deficient number, since it is larger than the sum of its proper divisors (2311345).

23304721 is a wasteful number, since it uses less digits than its factorization.

23304721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192623 (or 192612 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 23304721 is about 4827.4963490406. The cubic root of 23304721 is about 285.6371137171.

It can be divided in two parts, 23304 and 721, that added together give a square (24025 = 155²).

The spelling of 23304721 in words is "twenty-three million, three hundred four thousand, seven hundred twenty-one".