111121111242 has 12 divisors (see below), whose sum is σ = 240762407730. Its totient is φ = 37040370408.

The previous prime is 111121111193. The next prime is 111121111243. The reversal of 111121111242 is 242111121111.

It can be written as a sum of positive squares in only one way, i.e., 109826622801 + 1294488441 = 331401^2 + 35979^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 6173395069 = 111121111242 / (1 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 2 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (111121111243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3086697517 + ... + 3086697552.

Almost surely, 2^111121111242 is an apocalyptic number.

111121111242 is an abundant number, since it is smaller than the sum of its proper divisors (129641296488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111121111242 is a wasteful number, since it uses less digits than its factorization.

111121111242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6173395077 (or 6173395074 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 111121111242 its reverse (242111121111), we get a palindrome (353232232353).

The spelling of 111121111242 in words is "one hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, two hundred forty-two".