111222021121 has 2 divisors, whose sum is σ = 111222021122. Its totient is φ = 111222021120.

The previous prime is 111222021083. The next prime is 111222021137. The reversal of 111222021121 is 121120222111.

It is an a-pointer prime, because the next prime (111222021137) can be obtained adding 111222021121 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60456974400 + 50765046721 = 245880^2 + 225311^2 .

It is a cyclic number.

It is not a de Polignac number, because 111222021121 - 2²⁹ = 110685150209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111222021095 and 111222021104.

It is not a weakly prime, because it can be changed into another prime (111222021151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55611010560 + 55611010561.

It is an arithmetic number, because the mean of its divisors is an integer number (55611010561).

Almost surely, 2^111222021121 is an apocalyptic number.

It is an amenable number.

111222021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111222021121 is an equidigital number, since it uses as much as digits as its factorization.

111222021121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111222021121 its reverse (121120222111), we get a palindrome (232342243232).

The spelling of 111222021121 in words is "one hundred eleven billion, two hundred twenty-two million, twenty-one thousand, one hundred twenty-one".