16839021 has 8 divisors (see below), whose sum is σ = 22487904. Its totient is φ = 11208080.

The previous prime is 16839007. The next prime is 16839029. The reversal of 16839021 is 12093861.

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 16839021 - 2⁷ = 16838893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16839021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16839029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2115 + ... + 6176.

It is an arithmetic number, because the mean of its divisors is an integer number (2810988).

Almost surely, 2^16839021 is an apocalyptic number.

It is an amenable number.

16839021 is a deficient number, since it is larger than the sum of its proper divisors (5648883).

16839021 is an equidigital number, since it uses as much as digits as its factorization.

16839021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8971.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 16839021 is about 4103.5376201517. The cubic root of 16839021 is about 256.3139712585.

The spelling of 16839021 in words is "sixteen million, eight hundred thirty-nine thousand, twenty-one".