123131221113 has 4 divisors (see below), whose sum is σ = 164174961488. Its totient is φ = 82087480740.

The previous prime is 123131221099. The next prime is 123131221159. The reversal of 123131221113 is 311122131321.

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 an emirpimes, since its reverse is a distinct semiprime: 311122131321 = 3 ⋅103707377107.

It is not a de Polignac number, because 123131221113 - 2⁹ = 123131220601 is a prime.

It is a super-2 number, since 2×123131221113² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123131221113.

It is not an unprimeable number, because it can be changed into a prime (123131221183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20521870183 + ... + 20521870188.

It is an arithmetic number, because the mean of its divisors is an integer number (41043740372).

Almost surely, 2^123131221113 is an apocalyptic number.

It is an amenable number.

123131221113 is a deficient number, since it is larger than the sum of its proper divisors (41043740375).

123131221113 is an equidigital number, since it uses as much as digits as its factorization.

123131221113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41043740374.

The product of its digits is 216, while the sum is 21.

Adding to 123131221113 its reverse (311122131321), we get a palindrome (434253352434).

The spelling of 123131221113 in words is "one hundred twenty-three billion, one hundred thirty-one million, two hundred twenty-one thousand, one hundred thirteen".