111644022013 has 4 divisors (see below), whose sum is σ = 111644692000. Its totient is φ = 111643352028.

The previous prime is 111644021989. The next prime is 111644022067. The reversal of 111644022013 is 310220446111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 310220446111 = 70177 ⋅4420543.

It is a cyclic number.

It is not a de Polignac number, because 111644022013 - 2²¹ = 111641924861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111644022073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131488 + ... + 490486.

It is an arithmetic number, because the mean of its divisors is an integer number (27911173000).

Almost surely, 2^111644022013 is an apocalyptic number.

It is an amenable number.

111644022013 is a deficient number, since it is larger than the sum of its proper divisors (669987).

111644022013 is an equidigital number, since it uses as much as digits as its factorization.

111644022013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669986.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 111644022013 its reverse (310220446111), we get a palindrome (421864468124).

The spelling of 111644022013 in words is "one hundred eleven billion, six hundred forty-four million, twenty-two thousand, thirteen".