21641803804 has 12 divisors (see below), whose sum is σ = 38123973328. Its totient is φ = 10749240000.

The previous prime is 21641803787. The next prime is 21641803853. The reversal of 21641803804 is 40830814612.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17914797 + ... + 17916004.

Almost surely, 2^21641803804 is an apocalyptic number.

It is an amenable number.

21641803804 is a deficient number, since it is larger than the sum of its proper divisors (16482169524).

21641803804 is a wasteful number, since it uses less digits than its factorization.

21641803804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35830956 (or 35830954 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 21641803804 in words is "twenty-one billion, six hundred forty-one million, eight hundred three thousand, eight hundred four".