21072110328784 has 80 divisors (see below), whose sum is σ = 42379595121600. Its totient is φ = 10137969580032.

The previous prime is 21072110328779. The next prime is 21072110328803. The reversal of 21072110328784 is 48782301127012.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 228039039 + ... + 228131425.

It is an arithmetic number, because the mean of its divisors is an integer number (529744939020).

Almost surely, 2^{21072110328784} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21072110328784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21189797560800).

21072110328784 is an abundant number, since it is smaller than the sum of its proper divisors (21307484792816).

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

21072110328784 is a wasteful number, since it uses less digits than its factorization.

21072110328784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94100 (or 94094 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 21072110328784 in words is "twenty-one trillion, seventy-two billion, one hundred ten million, three hundred twenty-eight thousand, seven hundred eighty-four".