15596327921 has 2 divisors, whose sum is σ = 15596327922. Its totient is φ = 15596327920.

The previous prime is 15596327911. The next prime is 15596327947. The reversal of 15596327921 is 12972369551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10022212321 + 5574115600 = 100111^2 + 74660^2 .

It is a cyclic number.

It is not a de Polignac number, because 15596327921 - 2¹⁸ = 15596065777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15596327921.

It is not a weakly prime, because it can be changed into another prime (15596327911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7798163960 + 7798163961.

It is an arithmetic number, because the mean of its divisors is an integer number (7798163961).

Almost surely, 2^15596327921 is an apocalyptic number.

It is an amenable number.

15596327921 is a deficient number, since it is larger than the sum of its proper divisors (1).

15596327921 is an equidigital number, since it uses as much as digits as its factorization.

15596327921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020600, while the sum is 50.

The spelling of 15596327921 in words is "fifteen billion, five hundred ninety-six million, three hundred twenty-seven thousand, nine hundred twenty-one".