11111101321 has 4 divisors (see below), whose sum is σ = 11117808532. Its totient is φ = 11104394112.

The previous prime is 11111101319. The next prime is 11111101357. The reversal of 11111101321 is 12310111111.

11111101321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 5540718096 + 5570383225 = 74436^2 + 74635^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111101321 - 2¹ = 11111101319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111107321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3351120 + ... + 3354433.

It is an arithmetic number, because the mean of its divisors is an integer number (2779452133).

Almost surely, 2^11111101321 is an apocalyptic number.

It is an amenable number.

11111101321 is a deficient number, since it is larger than the sum of its proper divisors (6707211).

11111101321 is an equidigital number, since it uses as much as digits as its factorization.

11111101321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707210.

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 11111101321 its reverse (12310111111), we get a palindrome (23421212432).

The spelling of 11111101321 in words is "eleven billion, one hundred eleven million, one hundred one thousand, three hundred twenty-one".