111211222013 has 6 divisors (see below), whose sum is σ = 118137872826. Its totient is φ = 104669385152.

The previous prime is 111211221977. The next prime is 111211222049. The reversal of 111211222013 is 310222112111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111211221977) and next prime (111211222049).

It can be written as a sum of positive squares in 3 ways, for example, as 15870456484 + 95340765529 = 125978^2 + 308773^2 .

It is not a de Polignac number, because 111211222013 - 2⁶ = 111211221949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111211221982 and 111211222000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211222093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192406670 + ... + 192407247.

It is an arithmetic number, because the mean of its divisors is an integer number (19689645471).

Almost surely, 2^111211222013 is an apocalyptic number.

It is an amenable number.

111211222013 is a deficient number, since it is larger than the sum of its proper divisors (6926650813).

111211222013 is an equidigital number, since it uses as much as digits as its factorization.

111211222013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384813951 (or 384813934 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 111211222013 its reverse (310222112111), we get a palindrome (421433334124).

The spelling of 111211222013 in words is "one hundred eleven billion, two hundred eleven million, two hundred twenty-two thousand, thirteen".