111221100997 has 2 divisors, whose sum is σ = 111221100998. Its totient is φ = 111221100996.

The previous prime is 111221100979. The next prime is 111221101037. The reversal of 111221100997 is 799001122111.

Together with previous prime (111221100979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101073762241 + 10147338756 = 317921^2 + 100734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221100997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221100797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610550498 + 55610550499.

It is an arithmetic number, because the mean of its divisors is an integer number (55610550499).

Almost surely, 2^111221100997 is an apocalyptic number.

It is an amenable number.

111221100997 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221100997 is an equidigital number, since it uses as much as digits as its factorization.

111221100997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 34.

The spelling of 111221100997 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred thousand, nine hundred ninety-seven".