111111120122121 has 48 divisors (see below), whose sum is σ = 184869235200000. Its totient is φ = 62990959094784.

The previous prime is 111111120122113. The next prime is 111111120122131. The reversal of 111111120122121 is 121221021111111.

111111120122121 is a `hidden beast` number, since 1 + 111 + 111 + 201 + 221 + 21 = 666.

It is not a de Polignac number, because 111111120122121 - 2³ = 111111120122113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111111120122094 and 111111120122103.

It is not an unprimeable number, because it can be changed into a prime (111111120122131) 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 47 ways as a sum of consecutive naturals, for example, 609977185 + ... + 610159313.

It is an arithmetic number, because the mean of its divisors is an integer number (3851442400000).

Almost surely, 2^{111111120122121} is an apocalyptic number.

It is an amenable number.

111111120122121 is a deficient number, since it is larger than the sum of its proper divisors (73758115077879).

111111120122121 is a wasteful number, since it uses less digits than its factorization.

111111120122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258518 (or 258515 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111111120122121 its reverse (121221021111111), we get a palindrome (232332141233232).

The spelling of 111111120122121 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twenty million, one hundred twenty-two thousand, one hundred twenty-one".