21604552330 has 16 divisors (see below), whose sum is σ = 38994163200. Its totient is φ = 8618272272.

The previous prime is 21604552247. The next prime is 21604552373. The reversal of 21604552330 is 3325540612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21604552292 and 21604552301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2939730 + ... + 2947069.

It is an arithmetic number, because the mean of its divisors is an integer number (2437135200).

Almost surely, 2^21604552330 is an apocalyptic number.

21604552330 is a deficient number, since it is larger than the sum of its proper divisors (17389610870).

21604552330 is a wasteful number, since it uses less digits than its factorization.

21604552330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5887173.

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 21604552330 in words is "twenty-one billion, six hundred four million, five hundred fifty-two thousand, three hundred thirty".