11121320231 has 6 divisors (see below), whose sum is σ = 12937046040. Its totient is φ = 9532560156.

The previous prime is 11121320191. The next prime is 11121320257. The reversal of 11121320231 is 13202312111.

11121320231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11121320231 - 2⁶ = 11121320167 is a prime.

It is a super-2 number, since 2×11121320231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121320731) 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 5 ways as a sum of consecutive naturals, for example, 113482811 + ... + 113482908.

It is an arithmetic number, because the mean of its divisors is an integer number (2156174340).

Almost surely, 2^11121320231 is an apocalyptic number.

11121320231 is a deficient number, since it is larger than the sum of its proper divisors (1815725809).

11121320231 is an equidigital number, since it uses as much as digits as its factorization.

11121320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226965733 (or 226965726 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11121320231 its reverse (13202312111), we get a palindrome (24323632342).

The spelling of 11121320231 in words is "eleven billion, one hundred twenty-one million, three hundred twenty thousand, two hundred thirty-one".