111312100021813 has 2 divisors, whose sum is σ = 111312100021814. Its totient is φ = 111312100021812.

The previous prime is 111312100021757. The next prime is 111312100021849. The reversal of 111312100021813 is 318120001213111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109659286379889 + 1652813641924 = 10471833^2 + 1285618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111312100021813 is a prime.

It is a super-2 number, since 2×111312100021813² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111312100021853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55656050010906 + 55656050010907.

It is an arithmetic number, because the mean of its divisors is an integer number (55656050010907).

Almost surely, 2^{111312100021813} is an apocalyptic number.

It is an amenable number.

111312100021813 is a deficient number, since it is larger than the sum of its proper divisors (1).

111312100021813 is an equidigital number, since it uses as much as digits as its factorization.

111312100021813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

Adding to 111312100021813 its reverse (318120001213111), we get a palindrome (429432101234924).

The spelling of 111312100021813 in words is "one hundred eleven trillion, three hundred twelve billion, one hundred million, twenty-one thousand, eight hundred thirteen".