111021808913 has 2 divisors, whose sum is σ = 111021808914. Its totient is φ = 111021808912.

The previous prime is 111021808889. The next prime is 111021808921. The reversal of 111021808913 is 319808120111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96666893569 + 14354915344 = 310913^2 + 119812^2 .

It is an emirp because it is prime and its reverse (319808120111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111021808913 - 2¹⁰ = 111021807889 is a prime.

It is a super-3 number, since 3×111021808913³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (111021808973) 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, 55510904456 + 55510904457.

It is an arithmetic number, because the mean of its divisors is an integer number (55510904457).

Almost surely, 2^111021808913 is an apocalyptic number.

It is an amenable number.

111021808913 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021808913 is an equidigital number, since it uses as much as digits as its factorization.

111021808913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 35.

The spelling of 111021808913 in words is "one hundred eleven billion, twenty-one million, eight hundred eight thousand, nine hundred thirteen".