111131121120123 has 32 divisors (see below), whose sum is σ = 159681128185600. Its totient is φ = 68342010477696.

The previous prime is 111131121120119. The next prime is 111131121120241. The reversal of 111131121120123 is 321021121131111.

It is not a de Polignac number, because 111131121120123 - 2² = 111131121120119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111131121120123.

It is not an unprimeable number, because it can be changed into a prime (111131121120323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 356698308 + ... + 357009726.

It is an arithmetic number, because the mean of its divisors is an integer number (4990035255800).

Almost surely, 2^{111131121120123} is an apocalyptic number.

111131121120123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

111131121120123 is a deficient number, since it is larger than the sum of its proper divisors (48550007065477).

111131121120123 is a wasteful number, since it uses less digits than its factorization.

111131121120123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317611.

The product of its (nonzero) digits is 72, while the sum is 21.

Adding to 111131121120123 its reverse (321021121131111), we get a palindrome (432152242251234).

The spelling of 111131121120123 in words is "one hundred eleven trillion, one hundred thirty-one billion, one hundred twenty-one million, one hundred twenty thousand, one hundred twenty-three".