111000000121 has 4 divisors (see below), whose sum is σ = 111001133412. Its totient is φ = 110998866832.

The previous prime is 111000000109. The next prime is 111000000127. The reversal of 111000000121 is 121000000111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9516978025 + 101483022096 = 97555^2 + 318564^2 .

It is a cyclic number.

It is not a de Polignac number, because 111000000121 - 2¹¹ = 110999998073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111000000127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404206 + ... + 620791.

It is an arithmetic number, because the mean of its divisors is an integer number (27750283353).

Almost surely, 2^111000000121 is an apocalyptic number.

It is an amenable number.

111000000121 is a deficient number, since it is larger than the sum of its proper divisors (1133291).

111000000121 is a wasteful number, since it uses less digits than its factorization.

111000000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133290.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 111000000121 its reverse (121000000111), we get a palindrome (232000000232).

The spelling of 111000000121 in words is "one hundred eleven billion, one hundred twenty-one", and thus it is an aban number.