21313130331313 has 4 divisors (see below), whose sum is σ = 21323217001828. Its totient is φ = 21303043660800.

The previous prime is 21313130331307. The next prime is 21313130331329. The reversal of 21313130331313 is 31313303131312.

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 61242390784 + 21251887940529 = 247472^2 + 4609977^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313130331313 - 2²¹ = 21313128234161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313130331373) 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, 5043332088 + ... + 5043336313.

It is an arithmetic number, because the mean of its divisors is an integer number (5330804250457).

Almost surely, 2^{21313130331313} is an apocalyptic number.

It is an amenable number.

21313130331313 is a deficient number, since it is larger than the sum of its proper divisors (10086670515).

21313130331313 is a wasteful number, since it uses less digits than its factorization.

21313130331313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10086670514.

The product of its (nonzero) digits is 4374, while the sum is 28.

Adding to 21313130331313 its reverse (31313303131312), we get a palindrome (52626433462625).

The spelling of 21313130331313 in words is "twenty-one trillion, three hundred thirteen billion, one hundred thirty million, three hundred thirty-one thousand, three hundred thirteen".