111010111222121 has 2 divisors, whose sum is σ = 111010111222122. Its totient is φ = 111010111222120.

The previous prime is 111010111222013. The next prime is 111010111222163. The reversal of 111010111222121 is 121222111010111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108703248427225 + 2306862794896 = 10426085^2 + 1518836^2 .

It is a cyclic number.

It is not a de Polignac number, because 111010111222121 - 2¹⁸ = 111010110959977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111010111222121.

It is not a weakly prime, because it can be changed into another prime (111010111222921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505055611060 + 55505055611061.

It is an arithmetic number, because the mean of its divisors is an integer number (55505055611061).

Almost surely, 2^{111010111222121} is an apocalyptic number.

It is an amenable number.

111010111222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111010111222121 is an equidigital number, since it uses as much as digits as its factorization.

111010111222121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111010111222121 its reverse (121222111010111), we get a palindrome (232232222232232).

The spelling of 111010111222121 in words is "one hundred eleven trillion, ten billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".