21118603604 has 12 divisors (see below), whose sum is σ = 42237207264. Its totient is φ = 9050830104.

The previous prime is 21118603579. The next prime is 21118603621. The reversal of 21118603604 is 40630681112.

21118603604 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377117894 + ... + 377117949.

It is an arithmetic number, because the mean of its divisors is an integer number (3519767272).

Almost surely, 2^21118603604 is an apocalyptic number.

It is an amenable number.

21118603604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21118603604 is a wasteful number, since it uses less digits than its factorization.

21118603604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754235854 (or 754235852 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 21118603604 in words is "twenty-one billion, one hundred eighteen million, six hundred three thousand, six hundred four".