123311321213 has 4 divisors (see below), whose sum is σ = 125000517468. Its totient is φ = 121622124960.

The previous prime is 123311321201. The next prime is 123311321233. The reversal of 123311321213 is 312123113321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62518501369 + 60792819844 = 250037^2 + 246562^2 .

It is a cyclic number.

It is not a de Polignac number, because 123311321213 - 2⁴ = 123311321197 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 (123311321233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844598018 + ... + 844598163.

It is an arithmetic number, because the mean of its divisors is an integer number (31250129367).

Almost surely, 2^123311321213 is an apocalyptic number.

It is an amenable number.

123311321213 is a deficient number, since it is larger than the sum of its proper divisors (1689196255).

123311321213 is an equidigital number, since it uses as much as digits as its factorization.

123311321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689196254.

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

Adding to 123311321213 its reverse (312123113321), we get a palindrome (435434434534).

The spelling of 123311321213 in words is "one hundred twenty-three billion, three hundred eleven million, three hundred twenty-one thousand, two hundred thirteen".