111100000121 has 4 divisors (see below), whose sum is σ = 121200000144. Its totient is φ = 101000000100.

The previous prime is 111100000103. The next prime is 111100000127. The reversal of 111100000121 is 121000001111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121000001111 = 11 ⋅11000000101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111100000121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111100000099 and 111100000108.

It is not an unprimeable number, because it can be changed into a prime (111100000127) 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 3 ways as a sum of consecutive naturals, for example, 5049999995 + ... + 5050000016.

It is an arithmetic number, because the mean of its divisors is an integer number (30300000036).

Almost surely, 2^111100000121 is an apocalyptic number.

111100000121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111100000121 is a deficient number, since it is larger than the sum of its proper divisors (10100000023).

111100000121 is a wasteful number, since it uses less digits than its factorization.

111100000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10100000022.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 111100000121 its reverse (121000001111), we get a palindrome (232100001232).

The spelling of 111100000121 in words is "one hundred eleven billion, one hundred million, one hundred twenty-one", and thus it is an aban number.