11155330321 has 4 divisors (see below), whose sum is σ = 11155729444. Its totient is φ = 11154931200.

The previous prime is 11155330313. The next prime is 11155330337. The reversal of 11155330321 is 12303355111.

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 5220785025 + 5934545296 = 72255^2 + 77036^2 .

It is a cyclic number.

It is not a de Polignac number, because 11155330321 - 2³ = 11155330313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11155330301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154200 + ... + 214681.

It is an arithmetic number, because the mean of its divisors is an integer number (2788932361).

Almost surely, 2^11155330321 is an apocalyptic number.

It is an amenable number.

11155330321 is a deficient number, since it is larger than the sum of its proper divisors (399123).

11155330321 is an equidigital number, since it uses as much as digits as its factorization.

11155330321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399122.

The product of its (nonzero) digits is 1350, while the sum is 25.

Adding to 11155330321 its reverse (12303355111), we get a palindrome (23458685432).

The spelling of 11155330321 in words is "eleven billion, one hundred fifty-five million, three hundred thirty thousand, three hundred twenty-one".