16928000021 has 2 divisors, whose sum is σ = 16928000022. Its totient is φ = 16928000020.

The previous prime is 16927999987. The next prime is 16928000041. The reversal of 16928000021 is 12000082961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9769147921 + 7158852100 = 98839^2 + 84610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16928000021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16928000041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8464000010 + 8464000011.

It is an arithmetic number, because the mean of its divisors is an integer number (8464000011).

Almost surely, 2^16928000021 is an apocalyptic number.

It is an amenable number.

16928000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16928000021 is an equidigital number, since it uses as much as digits as its factorization.

16928000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

Adding to 16928000021 its reverse (12000082961), we get a palindrome (28928082982).

The spelling of 16928000021 in words is "sixteen billion, nine hundred twenty-eight million, twenty-one", and thus it is an aban number.