11172311321 has 4 divisors (see below), whose sum is σ = 11274809700. Its totient is φ = 11069812944.

The previous prime is 11172311303. The next prime is 11172311323. The reversal of 11172311321 is 12311327111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12311327111 = 41 ⋅300276271.

It can be written as a sum of positive squares in 2 ways, for example, as 3417571600 + 7754739721 = 58460^2 + 88061^2 .

It is a cyclic number.

It is not a de Polignac number, because 11172311321 - 2¹⁰ = 11172310297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11172311323) 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, 51249026 + ... + 51249243.

It is an arithmetic number, because the mean of its divisors is an integer number (2818702425).

Almost surely, 2^11172311321 is an apocalyptic number.

It is an amenable number.

11172311321 is a deficient number, since it is larger than the sum of its proper divisors (102498379).

11172311321 is a wasteful number, since it uses less digits than its factorization.

11172311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102498378.

The product of its digits is 252, while the sum is 23.

Adding to 11172311321 its reverse (12311327111), we get a palindrome (23483638432).

The spelling of 11172311321 in words is "eleven billion, one hundred seventy-two million, three hundred eleven thousand, three hundred twenty-one".