12021321313 has 4 divisors (see below), whose sum is σ = 12021889428. Its totient is φ = 12020753200.

The previous prime is 12021321307. The next prime is 12021321373. The reversal of 12021321313 is 31312312021.

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 4469189904 + 7552131409 = 66852^2 + 86903^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021321313 - 2⁵ = 12021321281 is a prime.

It is a super-2 number, since 2×12021321313² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021321373) 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, 251038 + ... + 295063.

It is an arithmetic number, because the mean of its divisors is an integer number (3005472357).

Almost surely, 2^12021321313 is an apocalyptic number.

It is an amenable number.

12021321313 is a deficient number, since it is larger than the sum of its proper divisors (568115).

12021321313 is an equidigital number, since it uses as much as digits as its factorization.

12021321313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568114.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12021321313 its reverse (31312312021), we get a palindrome (43333633334).

The spelling of 12021321313 in words is "twelve billion, twenty-one million, three hundred twenty-one thousand, three hundred thirteen".