313231120021 has 4 divisors (see below), whose sum is σ = 314133803712. Its totient is φ = 312328436332.

The previous prime is 313231120009. The next prime is 313231120061. The reversal of 313231120021 is 120021132313.

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.

It is a cyclic number.

It is not a de Polignac number, because 313231120021 - 2¹¹ = 313231117973 is a prime.

It is a super-2 number, since 2×313231120021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313231120001) 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, 451341325 + ... + 451342018.

It is an arithmetic number, because the mean of its divisors is an integer number (78533450928).

Almost surely, 2^313231120021 is an apocalyptic number.

It is an amenable number.

313231120021 is a deficient number, since it is larger than the sum of its proper divisors (902683691).

313231120021 is an equidigital number, since it uses as much as digits as its factorization.

313231120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902683690.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 313231120021 its reverse (120021132313), we get a palindrome (433252252334).

The spelling of 313231120021 in words is "three hundred thirteen billion, two hundred thirty-one million, one hundred twenty thousand, twenty-one".