111122111112121 has 4 divisors (see below), whose sum is σ = 111207523958244. Its totient is φ = 111036698266000.

The previous prime is 111122111112041. The next prime is 111122111112137. The reversal of 111122111112121 is 121211111221111.

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 13463028640000 + 97659082472121 = 3669200^2 + 9882261^2 .

It is a cyclic number.

It is not a de Polignac number, because 111122111112121 - 2³⁹ = 110572355298233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111122111112421) 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, 42706421110 + ... + 42706423711.

It is an arithmetic number, because the mean of its divisors is an integer number (27801880989561).

Almost surely, 2^{111122111112121} is an apocalyptic number.

It is an amenable number.

111122111112121 is a deficient number, since it is larger than the sum of its proper divisors (85412846123).

111122111112121 is an equidigital number, since it uses as much as digits as its factorization.

111122111112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85412846122.

The product of its digits is 16, while the sum is 19.

Adding to 111122111112121 its reverse (121211111221111), we get a palindrome (232333222333232).

The spelling of 111122111112121 in words is "one hundred eleven trillion, one hundred twenty-two billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".