13375017721 has 4 divisors (see below), whose sum is σ = 14403865252. Its totient is φ = 12346170192.

The previous prime is 13375017709. The next prime is 13375017749. The reversal of 13375017721 is 12771057331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5384624400 + 7990393321 = 73380^2 + 89389^2 .

It is a cyclic number.

It is not a de Polignac number, because 13375017721 - 2¹⁷ = 13374886649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13375017751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 514423746 + ... + 514423771.

It is an arithmetic number, because the mean of its divisors is an integer number (3600966313).

Almost surely, 2^13375017721 is an apocalyptic number.

It is an amenable number.

13375017721 is a deficient number, since it is larger than the sum of its proper divisors (1028847531).

13375017721 is a wasteful number, since it uses less digits than its factorization.

13375017721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028847530.

The product of its (nonzero) digits is 30870, while the sum is 37.

The spelling of 13375017721 in words is "thirteen billion, three hundred seventy-five million, seventeen thousand, seven hundred twenty-one".