111031221121 has 4 divisors (see below), whose sum is σ = 112130540244. Its totient is φ = 109931902000.

The previous prime is 111031221109. The next prime is 111031221137. The reversal of 111031221121 is 121122130111.

It is a happy number.

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 47768910721 + 63262310400 = 218561^2 + 251520^2 .

It is a cyclic number.

It is not a de Polignac number, because 111031221121 - 2⁵ = 111031221089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111031221095 and 111031221104.

It is not an unprimeable number, because it can be changed into a prime (111031222121) 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, 549659410 + ... + 549659611.

It is an arithmetic number, because the mean of its divisors is an integer number (28032635061).

Almost surely, 2^111031221121 is an apocalyptic number.

It is an amenable number.

111031221121 is a deficient number, since it is larger than the sum of its proper divisors (1099319123).

111031221121 is a wasteful number, since it uses less digits than its factorization.

111031221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099319122.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 111031221121 its reverse (121122130111), we get a palindrome (232153351232).

The spelling of 111031221121 in words is "one hundred eleven billion, thirty-one million, two hundred twenty-one thousand, one hundred twenty-one".