111221131081 has 2 divisors, whose sum is σ = 111221131082. Its totient is φ = 111221131080.

The previous prime is 111221131069. The next prime is 111221131111. The reversal of 111221131081 is 180131122111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110429271481 + 791859600 = 332309^2 + 28140^2 .

It is an emirp because it is prime and its reverse (180131122111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111221131081 - 2⁷ = 111221130953 is a prime.

It is a super-2 number, since 2×111221131081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111221131031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610565540 + 55610565541.

It is an arithmetic number, because the mean of its divisors is an integer number (55610565541).

Almost surely, 2^111221131081 is an apocalyptic number.

It is an amenable number.

111221131081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221131081 is an equidigital number, since it uses as much as digits as its factorization.

111221131081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 22.

Adding to 111221131081 its reverse (180131122111), we get a palindrome (291352253192).

The spelling of 111221131081 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred thirty-one thousand, eighty-one".