21604683 has 8 divisors (see below), whose sum is σ = 29171200. Its totient is φ = 14220648.

The previous prime is 21604669. The next prime is 21604699. The reversal of 21604683 is 38640612.

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

It is not a de Polignac number, because 21604683 - 2¹⁴ = 21588299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21604683.

It is not an unprimeable number, because it can be changed into a prime (21604643) 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, 45343 + ... + 45816.

It is an arithmetic number, because the mean of its divisors is an integer number (3646400).

Almost surely, 2^21604683 is an apocalyptic number.

21604683 is a deficient number, since it is larger than the sum of its proper divisors (7566517).

21604683 is an equidigital number, since it uses as much as digits as its factorization.

21604683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91241.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 21604683 is about 4648.0837987282. The cubic root of 21604683 is about 278.5154550073.

The spelling of 21604683 in words is "twenty-one million, six hundred four thousand, six hundred eighty-three".