111001021121 has 2 divisors, whose sum is σ = 111001021122. Its totient is φ = 111001021120.

The previous prime is 111001021099. The next prime is 111001021177. The reversal of 111001021121 is 121120100111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87181420225 + 23819600896 = 295265^2 + 154336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111001021121 is a prime.

It is not a weakly prime, because it can be changed into another prime (111001051121) 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, 55500510560 + 55500510561.

It is an arithmetic number, because the mean of its divisors is an integer number (55500510561).

Almost surely, 2^111001021121 is an apocalyptic number.

It is an amenable number.

111001021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111001021121 is an equidigital number, since it uses as much as digits as its factorization.

111001021121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 111001021121 its reverse (121120100111), we get a palindrome (232121121232).

The spelling of 111001021121 in words is "one hundred eleven billion, one million, twenty-one thousand, one hundred twenty-one".