111221112010121 has 2 divisors, whose sum is σ = 111221112010122. Its totient is φ = 111221112010120.

The previous prime is 111221112010093. The next prime is 111221112010147. The reversal of 111221112010121 is 121010211122111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106325712382096 + 4895399628025 = 10311436^2 + 2212555^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221112010121 - 2²² = 111221107815817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111221112010121.

It is not a weakly prime, because it can be changed into another prime (111221112010181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610556005060 + 55610556005061.

It is an arithmetic number, because the mean of its divisors is an integer number (55610556005061).

Almost surely, 2^{111221112010121} is an apocalyptic number.

It is an amenable number.

111221112010121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221112010121 is an equidigital number, since it uses as much as digits as its factorization.

111221112010121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111221112010121 its reverse (121010211122111), we get a palindrome (232231323132232).

The spelling of 111221112010121 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred twelve million, ten thousand, one hundred twenty-one".