21076864169 has 2 divisors, whose sum is σ = 21076864170. Its totient is φ = 21076864168.

The previous prime is 21076864157. The next prime is 21076864181. The reversal of 21076864169 is 96146867012.

It is a balanced prime because it is at equal distance from previous prime (21076864157) and next prime (21076864181).

It can be written as a sum of positive squares in only one way, i.e., 10878490000 + 10198374169 = 104300^2 + 100987^2 .

It is a cyclic number.

It is not a de Polignac number, because 21076864169 - 2⁴ = 21076864153 is a prime.

It is a super-2 number, since 2×21076864169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21076864139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538432084 + 10538432085.

It is an arithmetic number, because the mean of its divisors is an integer number (10538432085).

Almost surely, 2^21076864169 is an apocalyptic number.

It is an amenable number.

21076864169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21076864169 is an equidigital number, since it uses as much as digits as its factorization.

21076864169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 21076864169 in words is "twenty-one billion, seventy-six million, eight hundred sixty-four thousand, one hundred sixty-nine".