111000012121 has 4 divisors (see below), whose sum is σ = 112099022244. Its totient is φ = 109901002000.

The previous prime is 111000012113. The next prime is 111000012187. The reversal of 111000012121 is 121210000111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121210000111 = 101 ⋅1200099011.

It can be written as a sum of positive squares in 2 ways, for example, as 66672920521 + 44327091600 = 258211^2 + 210540^2 .

It is a cyclic number.

It is not a de Polignac number, because 111000012121 - 2³ = 111000012113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111000012098 and 111000012107.

It is not an unprimeable number, because it can be changed into a prime (111000018121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549504910 + ... + 549505111.

It is an arithmetic number, because the mean of its divisors is an integer number (28024755561).

Almost surely, 2^111000012121 is an apocalyptic number.

It is an amenable number.

111000012121 is a deficient number, since it is larger than the sum of its proper divisors (1099010123).

111000012121 is a wasteful number, since it uses less digits than its factorization.

111000012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099010122.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 111000012121 its reverse (121210000111), we get a palindrome (232210012232).

The spelling of 111000012121 in words is "one hundred eleven billion, twelve thousand, one hundred twenty-one".