1321331111321 has 8 divisors (see below), whose sum is σ = 1457678599944. Its totient is φ = 1189941713280.

The previous prime is 1321331111297. The next prime is 1321331111327. The reversal of 1321331111321 is 1231111331231.

It can be written as a sum of positive squares in 4 ways, for example, as 81003421321 + 1240327690000 = 284611^2 + 1113700^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321331111321 - 2¹⁸ = 1321330849177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321331111327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1239522086 + ... + 1239523151.

It is an arithmetic number, because the mean of its divisors is an integer number (182209824993).

Almost surely, 2^{1321331111321} is an apocalyptic number.

It is an amenable number.

1321331111321 is a deficient number, since it is larger than the sum of its proper divisors (136347488623).

1321331111321 is a wasteful number, since it uses less digits than its factorization.

1321331111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479045291.

The product of its digits is 324, while the sum is 23.

Adding to 1321331111321 its reverse (1231111331231), we get a palindrome (2552442442552).

The spelling of 1321331111321 in words is "one trillion, three hundred twenty-one billion, three hundred thirty-one million, one hundred eleven thousand, three hundred twenty-one".