111200021121121 has 2 divisors, whose sum is σ = 111200021121122. Its totient is φ = 111200021121120.

The previous prime is 111200021121113. The next prime is 111200021121143. The reversal of 111200021121121 is 121121120002111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109837107302400 + 1362913818721 = 10480320^2 + 1167439^2 .

It is an emirp because it is prime and its reverse (121121120002111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111200021121121 - 2³ = 111200021121113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111200021121095 and 111200021121104.

It is not a weakly prime, because it can be changed into another prime (111200121121121) 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, 55600010560560 + 55600010560561.

It is an arithmetic number, because the mean of its divisors is an integer number (55600010560561).

Almost surely, 2^{111200021121121} is an apocalyptic number.

It is an amenable number.

111200021121121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111200021121121 is an equidigital number, since it uses as much as digits as its factorization.

111200021121121 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 16.

Adding to 111200021121121 its reverse (121121120002111), we get a palindrome (232321141123232).

The spelling of 111200021121121 in words is "one hundred eleven trillion, two hundred billion, twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".