16764305221 has 2 divisors, whose sum is σ = 16764305222. Its totient is φ = 16764305220.

The previous prime is 16764305191. The next prime is 16764305263. The reversal of 16764305221 is 12250346761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15944112900 + 820192321 = 126270^2 + 28639^2 .

It is a cyclic number.

It is not a de Polignac number, because 16764305221 - 2⁵ = 16764305189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16764302221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8382152610 + 8382152611.

It is an arithmetic number, because the mean of its divisors is an integer number (8382152611).

Almost surely, 2^16764305221 is an apocalyptic number.

It is an amenable number.

16764305221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16764305221 is an equidigital number, since it uses as much as digits as its factorization.

16764305221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 16764305221 in words is "sixteen billion, seven hundred sixty-four million, three hundred five thousand, two hundred twenty-one".