18921319798084 has 96 divisors (see below), whose sum is σ = 38549988892800. Its totient is φ = 8030845992960.

The previous prime is 18921319798063. The next prime is 18921319798229. The reversal of 18921319798084 is 48089791312981.

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57812052 + ... + 58138420.

It is an arithmetic number, because the mean of its divisors is an integer number (401562384300).

Almost surely, 2^{18921319798084} is an apocalyptic number.

It is an amenable number.

18921319798084 is an abundant number, since it is smaller than the sum of its proper divisors (19628669094716).

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

18921319798084 is a wasteful number, since it uses less digits than its factorization.

18921319798084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327013 (or 327011 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 70.

The spelling of 18921319798084 in words is "eighteen trillion, nine hundred twenty-one billion, three hundred nineteen million, seven hundred ninety-eight thousand, eighty-four".