313123130021 has 4 divisors (see below), whose sum is σ = 337209524652. Its totient is φ = 289036735392.

The previous prime is 313123130011. The next prime is 313123130053. The reversal of 313123130021 is 120031321313.

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 213664893121 + 99458236900 = 462239^2 + 315370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313123130021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 313123129975 and 313123130002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313123130011) 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, 12043197296 + ... + 12043197321.

It is an arithmetic number, because the mean of its divisors is an integer number (84302381163).

Almost surely, 2^313123130021 is an apocalyptic number.

It is an amenable number.

313123130021 is a deficient number, since it is larger than the sum of its proper divisors (24086394631).

313123130021 is a wasteful number, since it uses less digits than its factorization.

313123130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24086394630.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 313123130021 its reverse (120031321313), we get a palindrome (433154451334).

The spelling of 313123130021 in words is "three hundred thirteen billion, one hundred twenty-three million, one hundred thirty thousand, twenty-one".