111010121101021 has 2 divisors, whose sum is σ = 111010121101022. Its totient is φ = 111010121101020.

The previous prime is 111010121100929. The next prime is 111010121101073. The reversal of 111010121101021 is 120101121010111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80074399464900 + 30935721636121 = 8948430^2 + 5561989^2 .

It is a cyclic number.

It is not a de Polignac number, because 111010121101021 - 2³⁹ = 110460365287133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111010121100992 and 111010121101010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111010121105021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505060550510 + 55505060550511.

It is an arithmetic number, because the mean of its divisors is an integer number (55505060550511).

Almost surely, 2^{111010121101021} is an apocalyptic number.

It is an amenable number.

111010121101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111010121101021 is an equidigital number, since it uses as much as digits as its factorization.

111010121101021 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 13.

Adding to 111010121101021 its reverse (120101121010111), we get a palindrome (231111242111132).

The spelling of 111010121101021 in words is "one hundred eleven trillion, ten billion, one hundred twenty-one million, one hundred one thousand, twenty-one".