21804386846 has 24 divisors (see below), whose sum is σ = 35811951336. Its totient is φ = 9874540320.

The previous prime is 21804386819. The next prime is 21804386917. The reversal of 21804386846 is 64868340812.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21804386794 and 21804386803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1681580 + ... + 1694496.

It is an arithmetic number, because the mean of its divisors is an integer number (1492164639).

Almost surely, 2^21804386846 is an apocalyptic number.

21804386846 is a deficient number, since it is larger than the sum of its proper divisors (14007564490).

21804386846 is a wasteful number, since it uses less digits than its factorization.

21804386846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13484 (or 13207 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 50.

The spelling of 21804386846 in words is "twenty-one billion, eight hundred four million, three hundred eighty-six thousand, eight hundred forty-six".