313320231221 has 4 divisors (see below), whose sum is σ = 313608475392. Its totient is φ = 313031987052.

The previous prime is 313320231199. The next prime is 313320231271. The reversal of 313320231221 is 122132023313.

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 313320231221 - 2⁶ = 313320231157 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 (313320231271) 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, 144120455 + ... + 144122628.

It is an arithmetic number, because the mean of its divisors is an integer number (78402118848).

Almost surely, 2^313320231221 is an apocalyptic number.

It is an amenable number.

313320231221 is a deficient number, since it is larger than the sum of its proper divisors (288244171).

313320231221 is a wasteful number, since it uses less digits than its factorization.

313320231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288244170.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 313320231221 its reverse (122132023313), we get a palindrome (435452254534).

The spelling of 313320231221 in words is "three hundred thirteen billion, three hundred twenty million, two hundred thirty-one thousand, two hundred twenty-one".