1320320121311 has 4 divisors (see below), whose sum is σ = 1356004448952. Its totient is φ = 1284635793672.

The previous prime is 1320320121271. The next prime is 1320320121317. The reversal of 1320320121311 is 1131210230231.

It is a happy number.

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 1320320121311 - 2¹⁸ = 1320319859167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320320121317) 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, 17842163765 + ... + 17842163838.

It is an arithmetic number, because the mean of its divisors is an integer number (339001112238).

Almost surely, 2^{1320320121311} is an apocalyptic number.

1320320121311 is a deficient number, since it is larger than the sum of its proper divisors (35684327641).

1320320121311 is an equidigital number, since it uses as much as digits as its factorization.

1320320121311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35684327640.

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

Adding to 1320320121311 its reverse (1131210230231), we get a palindrome (2451530351542).

The spelling of 1320320121311 in words is "one trillion, three hundred twenty billion, three hundred twenty million, one hundred twenty-one thousand, three hundred eleven".