1110111021161 has 2 divisors, whose sum is σ = 1110111021162. Its totient is φ = 1110111021160.

The previous prime is 1110111021157. The next prime is 1110111021181. The reversal of 1110111021161 is 1611201110111.

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., 833329811161 + 276781210000 = 912869^2 + 526100^2 .

It is an emirp because it is prime and its reverse (1611201110111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1110111021161 - 2² = 1110111021157 is a prime.

It is not a weakly prime, because it can be changed into another prime (1110111021121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555055510580 + 555055510581.

It is an arithmetic number, because the mean of its divisors is an integer number (555055510581).

Almost surely, 2^{1110111021161} is an apocalyptic number.

It is an amenable number.

1110111021161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1110111021161 is an equidigital number, since it uses as much as digits as its factorization.

1110111021161 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 1110111021161 its reverse (1611201110111), we get a palindrome (2721312131272).

The spelling of 1110111021161 in words is "one trillion, one hundred ten billion, one hundred eleven million, twenty-one thousand, one hundred sixty-one".