21118333688 has 8 divisors (see below), whose sum is σ = 39596875680. Its totient is φ = 10559166840.

The previous prime is 21118333631. The next prime is 21118333699. The reversal of 21118333688 is 88633381112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319895848 + ... + 1319895863.

It is an arithmetic number, because the mean of its divisors is an integer number (4949609460).

Almost surely, 2^21118333688 is an apocalyptic number.

It is an amenable number.

21118333688 is a deficient number, since it is larger than the sum of its proper divisors (18478541992).

21118333688 is a wasteful number, since it uses less digits than its factorization.

21118333688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639791717 (or 2639791713 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The spelling of 21118333688 in words is "twenty-one billion, one hundred eighteen million, three hundred thirty-three thousand, six hundred eighty-eight".