111012102100021 has 2 divisors, whose sum is σ = 111012102100022. Its totient is φ = 111012102100020.

The previous prime is 111012102100001. The next prime is 111012102100129. The reversal of 111012102100021 is 120001201210111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66717939291025 + 44294162808996 = 8168105^2 + 6655386^2 .

It is a cyclic number.

It is not a de Polignac number, because 111012102100021 - 2²³ = 111012093711413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111012102099974 and 111012102100010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111012102100001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55506051050010 + 55506051050011.

It is an arithmetic number, because the mean of its divisors is an integer number (55506051050011).

Almost surely, 2^{111012102100021} is an apocalyptic number.

It is an amenable number.

111012102100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111012102100021 is an equidigital number, since it uses as much as digits as its factorization.

111012102100021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111012102100021 its reverse (120001201210111), we get a palindrome (231013303310132).

The spelling of 111012102100021 in words is "one hundred eleven trillion, twelve billion, one hundred two million, one hundred thousand, twenty-one".