13495707721 has 2 divisors, whose sum is σ = 13495707722. Its totient is φ = 13495707720.

The previous prime is 13495707713. The next prime is 13495707751. The reversal of 13495707721 is 12770759431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8351949321 + 5143758400 = 91389^2 + 71720^2 .

It is a cyclic number.

It is not a de Polignac number, because 13495707721 - 2³ = 13495707713 is a prime.

It is not a weakly prime, because it can be changed into another prime (13495707751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6747853860 + 6747853861.

It is an arithmetic number, because the mean of its divisors is an integer number (6747853861).

Almost surely, 2^13495707721 is an apocalyptic number.

It is an amenable number.

13495707721 is a deficient number, since it is larger than the sum of its proper divisors (1).

13495707721 is an equidigital number, since it uses as much as digits as its factorization.

13495707721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 370440, while the sum is 46.

The spelling of 13495707721 in words is "thirteen billion, four hundred ninety-five million, seven hundred seven thousand, seven hundred twenty-one".