16930821 has 4 divisors (see below), whose sum is σ = 22574432. Its totient is φ = 11287212.

The previous prime is 16930807. The next prime is 16930877. The reversal of 16930821 is 12803961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16930821 - 2⁵ = 16930789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16930801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2821801 + ... + 2821806.

It is an arithmetic number, because the mean of its divisors is an integer number (5643608).

Almost surely, 2^16930821 is an apocalyptic number.

It is an amenable number.

16930821 is a deficient number, since it is larger than the sum of its proper divisors (5643611).

16930821 is an equidigital number, since it uses as much as digits as its factorization.

16930821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5643610.

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

The square root of 16930821 is about 4114.7078875663. The cubic root of 16930821 is about 256.7789031446.

The spelling of 16930821 in words is "sixteen million, nine hundred thirty thousand, eight hundred twenty-one".