1311444314021 has 4 divisors (see below), whose sum is σ = 1353748969344. Its totient is φ = 1269139658700.

The previous prime is 1311444313979. The next prime is 1311444314039. The reversal of 1311444314021 is 1204134441131.

It is a happy number.

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 1311444314021 - 2¹⁸ = 1311444051877 is a prime.

It is a super-2 number, since 2×1311444314021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311444314051) 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, 21152327615 + ... + 21152327676.

It is an arithmetic number, because the mean of its divisors is an integer number (338437242336).

Almost surely, 2^{1311444314021} is an apocalyptic number.

It is an amenable number.

1311444314021 is a deficient number, since it is larger than the sum of its proper divisors (42304655323).

1311444314021 is an equidigital number, since it uses as much as digits as its factorization.

1311444314021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42304655322.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 1311444314021 its reverse (1204134441131), we get a palindrome (2515578755152).

The spelling of 1311444314021 in words is "one trillion, three hundred eleven billion, four hundred forty-four million, three hundred fourteen thousand, twenty-one".