13395569921 has 2 divisors, whose sum is σ = 13395569922. Its totient is φ = 13395569920.

The previous prime is 13395569899. The next prime is 13395569953. The reversal of 13395569921 is 12996559331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13394821696 + 748225 = 115736^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 13395569921 - 2¹⁴ = 13395553537 is a prime.

It is not a weakly prime, because it can be changed into another prime (13395569321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6697784960 + 6697784961.

It is an arithmetic number, because the mean of its divisors is an integer number (6697784961).

Almost surely, 2^13395569921 is an apocalyptic number.

It is an amenable number.

13395569921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13395569921 is an equidigital number, since it uses as much as digits as its factorization.

13395569921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1968300, while the sum is 53.

The spelling of 13395569921 in words is "thirteen billion, three hundred ninety-five million, five hundred sixty-nine thousand, nine hundred twenty-one".