313113211021 has 4 divisors (see below), whose sum is σ = 337198842652. Its totient is φ = 289027579392.

The previous prime is 313113211001. The next prime is 313113211039. The reversal of 313113211021 is 120112311313.

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 61449452100 + 251663758921 = 247890^2 + 501661^2 .

It is a cyclic number.

It is not a de Polignac number, because 313113211021 - 2⁵ = 313113210989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 313113211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313113211001) 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, 12042815796 + ... + 12042815821.

It is an arithmetic number, because the mean of its divisors is an integer number (84299710663).

Almost surely, 2^313113211021 is an apocalyptic number.

It is an amenable number.

313113211021 is a deficient number, since it is larger than the sum of its proper divisors (24085631631).

313113211021 is a wasteful number, since it uses less digits than its factorization.

313113211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24085631630.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 313113211021 its reverse (120112311313), we get a palindrome (433225522334).

The spelling of 313113211021 in words is "three hundred thirteen billion, one hundred thirteen million, two hundred eleven thousand, twenty-one".