1312320013021 has 4 divisors (see below), whose sum is σ = 1312373779200. Its totient is φ = 1312266246844.

The previous prime is 1312320013009. The next prime is 1312320013031. The reversal of 1312320013021 is 1203100232131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1312320013021 - 2¹⁵ = 1312319980253 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 1312320013021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312320013001) 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, 26846461 + ... + 26895298.

It is an arithmetic number, because the mean of its divisors is an integer number (328093444800).

Almost surely, 2^{1312320013021} is an apocalyptic number.

It is an amenable number.

1312320013021 is a deficient number, since it is larger than the sum of its proper divisors (53766179).

1312320013021 is an equidigital number, since it uses as much as digits as its factorization.

1312320013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53766178.

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

Adding to 1312320013021 its reverse (1203100232131), we get a palindrome (2515420245152).

The spelling of 1312320013021 in words is "one trillion, three hundred twelve billion, three hundred twenty million, thirteen thousand, twenty-one".