21768315118 has 8 divisors (see below), whose sum is σ = 35620879320. Its totient is φ = 9894688680.

The previous prime is 21768315083. The next prime is 21768315133. The reversal of 21768315118 is 81151386712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21768315118³ (a number of 32 digits) contains 333 as substring.

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, 494734413 + ... + 494734456.

It is an arithmetic number, because the mean of its divisors is an integer number (4452609915).

Almost surely, 2^21768315118 is an apocalyptic number.

21768315118 is a deficient number, since it is larger than the sum of its proper divisors (13852564202).

21768315118 is a wasteful number, since it uses less digits than its factorization.

21768315118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989468882.

The product of its digits is 80640, while the sum is 43.

The spelling of 21768315118 in words is "twenty-one billion, seven hundred sixty-eight million, three hundred fifteen thousand, one hundred eighteen".