313211321021 has 4 divisors (see below), whose sum is σ = 314000266812. Its totient is φ = 312422375232.

The previous prime is 313211320931. The next prime is 313211321039. The reversal of 313211321021 is 120123112313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120123112313 = 131 ⋅916970323.

It can be written as a sum of positive squares in 2 ways, for example, as 278414522500 + 34796798521 = 527650^2 + 186539^2 .

It is a cyclic number.

It is not a de Polignac number, because 313211321021 - 2¹⁰ = 313211319997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313211320984 and 313211321002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313211021021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394472300 + ... + 394473093.

It is an arithmetic number, because the mean of its divisors is an integer number (78500066703).

Almost surely, 2^313211321021 is an apocalyptic number.

It is an amenable number.

313211321021 is a deficient number, since it is larger than the sum of its proper divisors (788945791).

313211321021 is an equidigital number, since it uses as much as digits as its factorization.

313211321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788945790.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 313211321021 its reverse (120123112313), we get a palindrome (433334433334).

The spelling of 313211321021 in words is "three hundred thirteen billion, two hundred eleven million, three hundred twenty-one thousand, twenty-one".