111211231311 has 8 divisors (see below), whose sum is σ = 164757379760. Its totient is φ = 74140820856.

The previous prime is 111211231303. The next prime is 111211231343. The reversal of 111211231311 is 113132112111.

111211231311 is a `hidden beast` number, since 1 + 1 + 121 + 1 + 231 + 311 = 666.

It is not a de Polignac number, because 111211231311 - 2³ = 111211231303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211231111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2059467220 + ... + 2059467273.

It is an arithmetic number, because the mean of its divisors is an integer number (20594672470).

Almost surely, 2^111211231311 is an apocalyptic number.

111211231311 is a deficient number, since it is larger than the sum of its proper divisors (53546148449).

111211231311 is an equidigital number, since it uses as much as digits as its factorization.

111211231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4118934502 (or 4118934496 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

Adding to 111211231311 its reverse (113132112111), we get a palindrome (224343343422).

The spelling of 111211231311 in words is "one hundred eleven billion, two hundred eleven million, two hundred thirty-one thousand, three hundred eleven".