111110031022121 has 2 divisors, whose sum is σ = 111110031022122. Its totient is φ = 111110031022120.

The previous prime is 111110031022099. The next prime is 111110031022189. The reversal of 111110031022121 is 121220130011111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71281057581721 + 39828973440400 = 8442811^2 + 6311020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111110031022121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111110031022121.

It is not a weakly prime, because it can be changed into another prime (111110031022721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555015511060 + 55555015511061.

It is an arithmetic number, because the mean of its divisors is an integer number (55555015511061).

Almost surely, 2^{111110031022121} is an apocalyptic number.

It is an amenable number.

111110031022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111110031022121 is an equidigital number, since it uses as much as digits as its factorization.

111110031022121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 111110031022121 its reverse (121220130011111), we get a palindrome (232330161033232).

The spelling of 111110031022121 in words is "one hundred eleven trillion, one hundred ten billion, thirty-one million, twenty-two thousand, one hundred twenty-one".