313303100021 has 4 divisors (see below), whose sum is σ = 313307611500. Its totient is φ = 313298588544.

The previous prime is 313303099969. The next prime is 313303100027. The reversal of 313303100021 is 120001303313.

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 249286509796 + 64016590225 = 499286^2 + 253015^2 .

It is a cyclic number.

It is not a de Polignac number, because 313303100021 - 2²⁶ = 313235991157 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 (313303100027) 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, 2149916 + ... + 2291013.

It is an arithmetic number, because the mean of its divisors is an integer number (78326902875).

Almost surely, 2^313303100021 is an apocalyptic number.

It is an amenable number.

313303100021 is a deficient number, since it is larger than the sum of its proper divisors (4511479).

313303100021 is an equidigital number, since it uses as much as digits as its factorization.

313303100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511478.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 313303100021 its reverse (120001303313), we get a palindrome (433304403334).

The spelling of 313303100021 in words is "three hundred thirteen billion, three hundred three million, one hundred thousand, twenty-one".