21104685356 has 12 divisors (see below), whose sum is σ = 36965295360. Its totient is φ = 10543172400.

The previous prime is 21104685353. The next prime is 21104685409. The reversal of 21104685356 is 65358640112.

It is not an unprimeable number, because it can be changed into a prime (21104685353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2287391 + ... + 2296598.

It is an arithmetic number, because the mean of its divisors is an integer number (3080441280).

Almost surely, 2^21104685356 is an apocalyptic number.

It is an amenable number.

21104685356 is a deficient number, since it is larger than the sum of its proper divisors (15860610004).

21104685356 is a wasteful number, since it uses less digits than its factorization.

21104685356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4585144 (or 4585142 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 21104685356 in words is "twenty-one billion, one hundred four million, six hundred eighty-five thousand, three hundred fifty-six".