21304241 has 8 divisors (see below), whose sum is σ = 25187520. Its totient is φ = 17630928.

The previous prime is 21304237. The next prime is 21304253. The reversal of 21304241 is 14240312.

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

It is not a de Polignac number, because 21304241 - 2² = 21304237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21304271) 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 7 ways as a sum of consecutive naturals, for example, 52271 + ... + 52676.

It is an arithmetic number, because the mean of its divisors is an integer number (3148440).

Almost surely, 2^21304241 is an apocalyptic number.

It is an amenable number.

21304241 is a deficient number, since it is larger than the sum of its proper divisors (3883279).

21304241 is a wasteful number, since it uses less digits than its factorization.

21304241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104983.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21304241 is about 4615.6517416287. The cubic root of 21304241 is about 277.2183805304.

Adding to 21304241 its reverse (14240312), we get a palindrome (35544553).

The spelling of 21304241 in words is "twenty-one million, three hundred four thousand, two hundred forty-one".