313211120021 has 4 divisors (see below), whose sum is σ = 324011503500. Its totient is φ = 302410736544.

The previous prime is 313211120017. The next prime is 313211120039. The reversal of 313211120021 is 120021112313.

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 78000669796 + 235210450225 = 279286^2 + 484985^2 .

It is a cyclic number.

It is not a de Polignac number, because 313211120021 - 2² = 313211120017 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 (313211120011) 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, 5400191696 + ... + 5400191753.

It is an arithmetic number, because the mean of its divisors is an integer number (81002875875).

Almost surely, 2^313211120021 is an apocalyptic number.

It is an amenable number.

313211120021 is a deficient number, since it is larger than the sum of its proper divisors (10800383479).

313211120021 is a wasteful number, since it uses less digits than its factorization.

313211120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10800383478.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 313211120021 its reverse (120021112313), we get a palindrome (433232232334).

The spelling of 313211120021 in words is "three hundred thirteen billion, two hundred eleven million, one hundred twenty thousand, twenty-one".