21164330713 has 2 divisors, whose sum is σ = 21164330714. Its totient is φ = 21164330712.

The previous prime is 21164330689. The next prime is 21164330753. The reversal of 21164330713 is 31703346112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15038607424 + 6125723289 = 122632^2 + 78267^2 .

It is a cyclic number.

It is not a de Polignac number, because 21164330713 - 2²⁵ = 21130776281 is a prime.

It is not a weakly prime, because it can be changed into another prime (21164330753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10582165356 + 10582165357.

It is an arithmetic number, because the mean of its divisors is an integer number (10582165357).

Almost surely, 2^21164330713 is an apocalyptic number.

It is an amenable number.

21164330713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21164330713 is an equidigital number, since it uses as much as digits as its factorization.

21164330713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

Adding to 21164330713 its reverse (31703346112), we get a palindrome (52867676825).

The spelling of 21164330713 in words is "twenty-one billion, one hundred sixty-four million, three hundred thirty thousand, seven hundred thirteen".