111121322121 has 16 divisors (see below), whose sum is σ = 164816308800. Its totient is φ = 73994423904.

The previous prime is 111121322119. The next prime is 111121322131. The reversal of 111121322121 is 121223121111.

It is a happy number.

It is not a de Polignac number, because 111121322121 - 2¹ = 111121322119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111121322094 and 111121322103.

It is not an unprimeable number, because it can be changed into a prime (111121322131) 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 15 ways as a sum of consecutive naturals, for example, 2378031 + ... + 2424308.

It is an arithmetic number, because the mean of its divisors is an integer number (10301019300).

Almost surely, 2^111121322121 is an apocalyptic number.

It is an amenable number.

111121322121 is a deficient number, since it is larger than the sum of its proper divisors (53694986679).

111121322121 is an equidigital number, since it uses as much as digits as its factorization.

111121322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4803205 (or 4803199 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 111121322121 its reverse (121223121111), we get a palindrome (232344443232).

The spelling of 111121322121 in words is "one hundred eleven billion, one hundred twenty-one million, three hundred twenty-two thousand, one hundred twenty-one".