111101112121 has 4 divisors (see below), whose sum is σ = 111109012992. Its totient is φ = 111093211252.

The previous prime is 111101112113. The next prime is 111101112131. The reversal of 111101112121 is 121211101111.

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: 121211101111 = 131 ⋅925275581.

It is a cyclic number.

It is not a de Polignac number, because 111101112121 - 2³ = 111101112113 is a prime.

It is a super-2 number, since 2×111101112121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111101112131) 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, 3929305 + ... + 3957478.

It is an arithmetic number, because the mean of its divisors is an integer number (27777253248).

Almost surely, 2^111101112121 is an apocalyptic number.

It is an amenable number.

111101112121 is a deficient number, since it is larger than the sum of its proper divisors (7900871).

111101112121 is an equidigital number, since it uses as much as digits as its factorization.

111101112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7900870.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111101112121 its reverse (121211101111), we get a palindrome (232312213232).

The spelling of 111101112121 in words is "one hundred eleven billion, one hundred one million, one hundred twelve thousand, one hundred twenty-one".