11311121321 has 4 divisors (see below), whose sum is σ = 11351955972. Its totient is φ = 11270286672.

The previous prime is 11311121317. The next prime is 11311121333. The reversal of 11311121321 is 12312111311.

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 5154522025 + 6156599296 = 71795^2 + 78464^2 .

It is a cyclic number.

It is not a de Polignac number, because 11311121321 - 2² = 11311121317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11311121321.

It is not an unprimeable number, because it can be changed into a prime (11311141321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20416910 + ... + 20417463.

It is an arithmetic number, because the mean of its divisors is an integer number (2837988993).

Almost surely, 2^11311121321 is an apocalyptic number.

It is an amenable number.

11311121321 is a deficient number, since it is larger than the sum of its proper divisors (40834651).

11311121321 is an equidigital number, since it uses as much as digits as its factorization.

11311121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40834650.

The product of its digits is 36, while the sum is 17.

Adding to 11311121321 its reverse (12312111311), we get a palindrome (23623232632).

The spelling of 11311121321 in words is "eleven billion, three hundred eleven million, one hundred twenty-one thousand, three hundred twenty-one".