313231302121 has 16 divisors (see below), whose sum is σ = 335487925008. Its totient is φ = 291409920000.

The previous prime is 313231302113. The next prime is 313231302127. The reversal of 313231302121 is 121203132313.

It can be written as a sum of positive squares in 8 ways, for example, as 53324046400 + 259907255721 = 230920^2 + 509811^2 .

It is not a de Polignac number, because 313231302121 - 2³ = 313231302113 is a prime.

It is a super-2 number, since 2×313231302121² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 313231302092 and 313231302101.

It is not an unprimeable number, because it can be changed into a prime (313231302127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 903721 + ... + 1201321.

It is an arithmetic number, because the mean of its divisors is an integer number (20967995313).

Almost surely, 2^313231302121 is an apocalyptic number.

It is an amenable number.

313231302121 is a deficient number, since it is larger than the sum of its proper divisors (22256622887).

313231302121 is a wasteful number, since it uses less digits than its factorization.

313231302121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298332.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 313231302121 its reverse (121203132313), we get a palindrome (434434434434).

The spelling of 313231302121 in words is "three hundred thirteen billion, two hundred thirty-one million, three hundred two thousand, one hundred twenty-one".