11420111231 has 4 divisors (see below), whose sum is σ = 11813908200. Its totient is φ = 11026314264.

The previous prime is 11420111191. The next prime is 11420111237. The reversal of 11420111231 is 13211102411.

11420111231 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11420111231 is a prime.

It is a super-2 number, since 2×11420111231² (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 (11420111237) 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, 196898441 + ... + 196898498.

It is an arithmetic number, because the mean of its divisors is an integer number (2953477050).

Almost surely, 2^11420111231 is an apocalyptic number.

11420111231 is a deficient number, since it is larger than the sum of its proper divisors (393796969).

11420111231 is an equidigital number, since it uses as much as digits as its factorization.

11420111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393796968.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 11420111231 its reverse (13211102411), we get a palindrome (24631213642).

The spelling of 11420111231 in words is "eleven billion, four hundred twenty million, one hundred eleven thousand, two hundred thirty-one".