21304617 has 8 divisors (see below), whose sum is σ = 28429440. Its totient is φ = 14191440.

The previous prime is 21304603. The next prime is 21304627. The reversal of 21304617 is 71640312.

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

It is not a de Polignac number, because 21304617 - 2¹¹ = 21302569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21304627) 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, 3184 + ... + 7262.

It is an arithmetic number, because the mean of its divisors is an integer number (3553680).

Almost surely, 2^21304617 is an apocalyptic number.

It is an amenable number.

21304617 is a deficient number, since it is larger than the sum of its proper divisors (7124823).

21304617 is a wasteful number, since it uses less digits than its factorization.

21304617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5823.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21304617 is about 4615.6924724249. The cubic root of 21304617 is about 277.2200114028.

Adding to 21304617 its reverse (71640312), we get a palindrome (92944929).

The spelling of 21304617 in words is "twenty-one million, three hundred four thousand, six hundred seventeen".