16855828721 has 8 divisors (see below), whose sum is σ = 17140492224. Its totient is φ = 16571434320.

The previous prime is 16855828697. The next prime is 16855828723. The reversal of 16855828721 is 12782855861.

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

It is a cyclic number.

It is not a de Polignac number, because 16855828721 - 2¹⁰ = 16855827697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16855828723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61106 + ... + 193508.

It is an arithmetic number, because the mean of its divisors is an integer number (2142561528).

Almost surely, 2^16855828721 is an apocalyptic number.

It is an amenable number.

16855828721 is a deficient number, since it is larger than the sum of its proper divisors (284663503).

16855828721 is a wasteful number, since it uses less digits than its factorization.

16855828721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134551.

The product of its digits is 2150400, while the sum is 53.

The spelling of 16855828721 in words is "sixteen billion, eight hundred fifty-five million, eight hundred twenty-eight thousand, seven hundred twenty-one".