16888685221 has 2 divisors, whose sum is σ = 16888685222. Its totient is φ = 16888685220.

The previous prime is 16888685197. The next prime is 16888685251. The reversal of 16888685221 is 12258688861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14907189025 + 1981496196 = 122095^2 + 44514^2 .

It is a cyclic number.

It is not a de Polignac number, because 16888685221 - 2¹¹ = 16888683173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16888685251) 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, 8444342610 + 8444342611.

It is an arithmetic number, because the mean of its divisors is an integer number (8444342611).

Almost surely, 2^16888685221 is an apocalyptic number.

It is an amenable number.

16888685221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16888685221 is an equidigital number, since it uses as much as digits as its factorization.

16888685221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2949120, while the sum is 55.

The spelling of 16888685221 in words is "sixteen billion, eight hundred eighty-eight million, six hundred eighty-five thousand, two hundred twenty-one".