111231323213 has 4 divisors (see below), whose sum is σ = 111361115580. Its totient is φ = 111101530848.

The previous prime is 111231323131. The next prime is 111231323219. The reversal of 111231323213 is 312323132111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312323132111 = 1709 ⋅182751979.

It can be written as a sum of positive squares in 2 ways, for example, as 56281868644 + 54949454569 = 237238^2 + 234413^2 .

It is a cyclic number.

It is not a de Polignac number, because 111231323213 - 2¹⁴ = 111231306829 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 (111231323219) 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, 64894898 + ... + 64896611.

It is an arithmetic number, because the mean of its divisors is an integer number (27840278895).

Almost surely, 2^111231323213 is an apocalyptic number.

It is an amenable number.

111231323213 is a deficient number, since it is larger than the sum of its proper divisors (129792367).

111231323213 is an equidigital number, since it uses as much as digits as its factorization.

111231323213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129792366.

The product of its digits is 648, while the sum is 23.

Adding to 111231323213 its reverse (312323132111), we get a palindrome (423554455324).

The spelling of 111231323213 in words is "one hundred eleven billion, two hundred thirty-one million, three hundred twenty-three thousand, two hundred thirteen".