16800977021 has 2 divisors, whose sum is σ = 16800977022. Its totient is φ = 16800977020.

The previous prime is 16800976981. The next prime is 16800977041. The reversal of 16800977021 is 12077900861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16650031225 + 150945796 = 129035^2 + 12286^2 .

It is a cyclic number.

It is not a de Polignac number, because 16800977021 - 2¹⁴ = 16800960637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16800977021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16800977041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8400488510 + 8400488511.

It is an arithmetic number, because the mean of its divisors is an integer number (8400488511).

Almost surely, 2^16800977021 is an apocalyptic number.

It is an amenable number.

16800977021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16800977021 is an equidigital number, since it uses as much as digits as its factorization.

16800977021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 41.

The spelling of 16800977021 in words is "sixteen billion, eight hundred million, nine hundred seventy-seven thousand, twenty-one".