111010121010161 has 2 divisors, whose sum is σ = 111010121010162. Its totient is φ = 111010121010160.

The previous prime is 111010121010137. The next prime is 111010121010169. The reversal of 111010121010161 is 161010121010111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96242770915600 + 14767350094561 = 9810340^2 + 3842831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111010121010161 is a prime.

It is not a weakly prime, because it can be changed into another prime (111010121010169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505060505080 + 55505060505081.

It is an arithmetic number, because the mean of its divisors is an integer number (55505060505081).

Almost surely, 2^{111010121010161} is an apocalyptic number.

It is an amenable number.

111010121010161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111010121010161 is an equidigital number, since it uses as much as digits as its factorization.

111010121010161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 111010121010161 its reverse (161010121010111), we get a palindrome (272020242020272).

The spelling of 111010121010161 in words is "one hundred eleven trillion, ten billion, one hundred twenty-one million, ten thousand, one hundred sixty-one".