16828021 has 12 divisors (see below), whose sum is σ = 19994688. Its totient is φ = 14115192.

The previous prime is 16828003. The next prime is 16828057. The reversal of 16828021 is 12082861.

It is not a de Polignac number, because 16828021 - 2⁵ = 16827989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16828321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1351 + ... + 5956.

It is an arithmetic number, because the mean of its divisors is an integer number (1666224).

Almost surely, 2^16828021 is an apocalyptic number.

It is an amenable number.

16828021 is a deficient number, since it is larger than the sum of its proper divisors (3166667).

16828021 is an equidigital number, since it uses as much as digits as its factorization.

16828021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368 (or 7361 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 16828021 is about 4102.1970942411. The cubic root of 16828021 is about 256.2581471929.

The spelling of 16828021 in words is "sixteen million, eight hundred twenty-eight thousand, twenty-one".