21304841 has 8 divisors (see below), whose sum is σ = 21764160. Its totient is φ = 20848912.

The previous prime is 21304817. The next prime is 21304847. The reversal of 21304841 is 14840312.

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 21304841 - 2¹⁰ = 21303817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21304847) 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, 14831 + ... + 16203.

It is an arithmetic number, because the mean of its divisors is an integer number (2720520).

Almost surely, 2^21304841 is an apocalyptic number.

It is an amenable number.

21304841 is a deficient number, since it is larger than the sum of its proper divisors (459319).

21304841 is a wasteful number, since it uses less digits than its factorization.

21304841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21304841 is about 4615.7167374093. The cubic root of 21304841 is about 277.2209829773.

The spelling of 21304841 in words is "twenty-one million, three hundred four thousand, eight hundred forty-one".