16853721 has 8 divisors (see below), whose sum is σ = 22994400. Its totient is φ = 10974432.

The previous prime is 16853717. The next prime is 16853723. The reversal of 16853721 is 12735861.

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

It is not a de Polignac number, because 16853721 - 2² = 16853717 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (16853723) 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, 65196 + ... + 65453.

It is an arithmetic number, because the mean of its divisors is an integer number (2874300).

Almost surely, 2^16853721 is an apocalyptic number.

It is an amenable number.

16853721 is a deficient number, since it is larger than the sum of its proper divisors (6140679).

16853721 is a wasteful number, since it uses less digits than its factorization.

16853721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130695.

The product of its digits is 10080, while the sum is 33.

The square root of 16853721 is about 4105.3283668910. The cubic root of 16853721 is about 256.3885345701.

The spelling of 16853721 in words is "sixteen million, eight hundred fifty-three thousand, seven hundred twenty-one".