21804391080108 has 384 divisors, whose sum is σ = 75023418624000. Its totient is φ = 5315066449920.

The previous prime is 21804391080091. The next prime is 21804391080113. The reversal of 21804391080108 is 80108019340812.

21804391080108 is a `hidden beast` number, since 2 + 1 + 8 + 0 + 439 + 108 + 0 + 108 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6232008 + ... + 9080016.

It is an arithmetic number, because the mean of its divisors is an integer number (195373486000).

Almost surely, 2^{21804391080108} is an apocalyptic number.

21804391080108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21804391080108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37511709312000).

21804391080108 is an abundant number, since it is smaller than the sum of its proper divisors (53219027543892).

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

21804391080108 is a wasteful number, since it uses less digits than its factorization.

21804391080108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848102 (or 2848094 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 21804391080108 in words is "twenty-one trillion, eight hundred four billion, three hundred ninety-one million, eighty thousand, one hundred eight".