13313312021 has 4 divisors (see below), whose sum is σ = 13342963500. Its totient is φ = 13283660544.

The previous prime is 13313312011. The next prime is 13313312041. The reversal of 13313312021 is 12021331331.

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 6472202500 + 6841109521 = 80450^2 + 82711^2 .

It is a cyclic number.

It is not a de Polignac number, because 13313312021 - 2³⁰ = 12239570197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13313311984 and 13313312002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13313312011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14825066 + ... + 14825963.

It is an arithmetic number, because the mean of its divisors is an integer number (3335740875).

Almost surely, 2^13313312021 is an apocalyptic number.

It is an amenable number.

13313312021 is a deficient number, since it is larger than the sum of its proper divisors (29651479).

13313312021 is an equidigital number, since it uses as much as digits as its factorization.

13313312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29651478.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 13313312021 its reverse (12021331331), we get a palindrome (25334643352).

The spelling of 13313312021 in words is "thirteen billion, three hundred thirteen million, three hundred twelve thousand, twenty-one".