111121112121 has 8 divisors (see below), whose sum is σ = 150956982720. Its totient is φ = 72682991472.

The previous prime is 111121112117. The next prime is 111121112143. The reversal of 111121112121 is 121211121111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111121112121 - 2² = 111121112117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111121112121.

It is not an unprimeable number, because it can be changed into a prime (111121112101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349437301 + ... + 349437618.

It is an arithmetic number, because the mean of its divisors is an integer number (18869622840).

Almost surely, 2^111121112121 is an apocalyptic number.

It is an amenable number.

111121112121 is a deficient number, since it is larger than the sum of its proper divisors (39835870599).

111121112121 is an equidigital number, since it uses as much as digits as its factorization.

111121112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698874975.

The product of its digits is 8, while the sum is 15.

Adding to 111121112121 its reverse (121211121111), we get a palindrome (232332233232).

The spelling of 111121112121 in words is "one hundred eleven billion, one hundred twenty-one million, one hundred twelve thousand, one hundred twenty-one".