1321338815971 has 4 divisors (see below), whose sum is σ = 1390882964200. Its totient is φ = 1251794667744.

The previous prime is 1321338815969. The next prime is 1321338815977. The reversal of 1321338815971 is 1795188331231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321338815971 - 2¹ = 1321338815969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321338815977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34772074086 + ... + 34772074123.

It is an arithmetic number, because the mean of its divisors is an integer number (347720741050).

Almost surely, 2^{1321338815971} is an apocalyptic number.

1321338815971 is a deficient number, since it is larger than the sum of its proper divisors (69544148229).

1321338815971 is an equidigital number, since it uses as much as digits as its factorization.

1321338815971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69544148228.

The product of its digits is 1088640, while the sum is 52.

The spelling of 1321338815971 in words is "one trillion, three hundred twenty-one billion, three hundred thirty-eight million, eight hundred fifteen thousand, nine hundred seventy-one".