111213020081 has 2 divisors, whose sum is σ = 111213020082. Its totient is φ = 111213020080.

The previous prime is 111213020059. The next prime is 111213020101. The reversal of 111213020081 is 180020312111.

It is a happy number.

It is an a-pointer prime, because the next prime (111213020101) can be obtained adding 111213020081 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110500397056 + 712623025 = 332416^2 + 26695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111213020081 is a prime.

It is a super-2 number, since 2×111213020081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111213020041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606510040 + 55606510041.

It is an arithmetic number, because the mean of its divisors is an integer number (55606510041).

Almost surely, 2^111213020081 is an apocalyptic number.

It is an amenable number.

111213020081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111213020081 is an equidigital number, since it uses as much as digits as its factorization.

111213020081 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 20.

Adding to 111213020081 its reverse (180020312111), we get a palindrome (291233332192).

The spelling of 111213020081 in words is "one hundred eleven billion, two hundred thirteen million, twenty thousand, eighty-one".