111312100121 has 6 divisors (see below), whose sum is σ = 116362177050. Its totient is φ = 106472443088.

The previous prime is 111312100099. The next prime is 111312100127. The reversal of 111312100121 is 121001213111.

It can be written as a sum of positive squares in only one way, i.e., 110227320025 + 1084780096 = 332005^2 + 32936^2 .

It is not a de Polignac number, because 111312100121 - 2⁶ = 111312100057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111312100096 and 111312100105.

It is not an unprimeable number, because it can be changed into a prime (111312100127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105209396 + ... + 105210453.

It is an arithmetic number, because the mean of its divisors is an integer number (19393696175).

Almost surely, 2^111312100121 is an apocalyptic number.

It is an amenable number.

111312100121 is a deficient number, since it is larger than the sum of its proper divisors (5050076929).

111312100121 is an equidigital number, since it uses as much as digits as its factorization.

111312100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210419895 (or 210419872 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 111312100121 its reverse (121001213111), we get a palindrome (232313313232).

The spelling of 111312100121 in words is "one hundred eleven billion, three hundred twelve million, one hundred thousand, one hundred twenty-one".