21326560117 has 2 divisors, whose sum is σ = 21326560118. Its totient is φ = 21326560116.

The previous prime is 21326560111. The next prime is 21326560141. The reversal of 21326560117 is 71106562312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13603489956 + 7723070161 = 116634^2 + 87881^2 .

It is a cyclic number.

It is not a de Polignac number, because 21326560117 - 2³ = 21326560109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21326560111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10663280058 + 10663280059.

It is an arithmetic number, because the mean of its divisors is an integer number (10663280059).

Almost surely, 2^21326560117 is an apocalyptic number.

It is an amenable number.

21326560117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21326560117 is an equidigital number, since it uses as much as digits as its factorization.

21326560117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21326560117 in words is "twenty-one billion, three hundred twenty-six million, five hundred sixty thousand, one hundred seventeen".