1311620003021 has 4 divisors (see below), whose sum is σ = 1343610734844. Its totient is φ = 1279629271200.

The previous prime is 1311620003009. The next prime is 1311620003053. The reversal of 1311620003021 is 1203000261131.

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 769504401796 + 542115601225 = 877214^2 + 736285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311620003021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1311620002984 and 1311620003002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311620003821) 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, 15995365850 + ... + 15995365931.

It is an arithmetic number, because the mean of its divisors is an integer number (335902683711).

Almost surely, 2^{1311620003021} is an apocalyptic number.

It is an amenable number.

1311620003021 is a deficient number, since it is larger than the sum of its proper divisors (31990731823).

1311620003021 is an equidigital number, since it uses as much as digits as its factorization.

1311620003021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31990731822.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1311620003021 its reverse (1203000261131), we get a palindrome (2514620264152).

The spelling of 1311620003021 in words is "one trillion, three hundred eleven billion, six hundred twenty million, three thousand, twenty-one".