111231220122 has 60 divisors (see below), whose sum is σ = 265100056650. Its totient is φ = 33706350480.

The previous prime is 111231220057. The next prime is 111231220127. The reversal of 111231220122 is 221022132111.

111231220122 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 110803102641 + 428117481 = 332871^2 + 20691^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 111231220095 and 111231220104.

It is not an unprimeable number, because it can be changed into a prime (111231220127) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 52504 + ... + 474572.

Almost surely, 2^111231220122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111231220122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132550028325).

111231220122 is an abundant number, since it is smaller than the sum of its proper divisors (153868836528).

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

111231220122 is an equidigital number, since it uses as much as digits as its factorization.

111231220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422121 (or 422085 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 111231220122 its reverse (221022132111), we get a palindrome (332253352233).

The spelling of 111231220122 in words is "one hundred eleven billion, two hundred thirty-one million, two hundred twenty thousand, one hundred twenty-two".