313012031221 has 4 divisors (see below), whose sum is σ = 313289279500. Its totient is φ = 312734782944.

The previous prime is 313012031219. The next prime is 313012031237. The reversal of 313012031221 is 122130210313.

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 199281888100 + 113730143121 = 446410^2 + 337239^2 .

It is a cyclic number.

It is not a de Polignac number, because 313012031221 - 2¹ = 313012031219 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 (313012031921) 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, 138622446 + ... + 138624703.

It is an arithmetic number, because the mean of its divisors is an integer number (78322319875).

Almost surely, 2^313012031221 is an apocalyptic number.

It is an amenable number.

313012031221 is a deficient number, since it is larger than the sum of its proper divisors (277248279).

313012031221 is a wasteful number, since it uses less digits than its factorization.

313012031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277248278.

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

Adding to 313012031221 its reverse (122130210313), we get a palindrome (435142241534).

The spelling of 313012031221 in words is "three hundred thirteen billion, twelve million, thirty-one thousand, two hundred twenty-one".