1320121321331 has 4 divisors (see below), whose sum is σ = 1323446564352. Its totient is φ = 1316796078312.

The previous prime is 1320121321247. The next prime is 1320121321381. The reversal of 1320121321331 is 1331231210231.

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

It is a de Polignac number, because none of the positive numbers 2^k-1320121321331 is a prime.

It is a super-2 number, since 2×1320121321331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320121321297 and 1320121321306.

It is not an unprimeable number, because it can be changed into a prime (1320121321381) 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, 1662620915 + ... + 1662621708.

It is an arithmetic number, because the mean of its divisors is an integer number (330861641088).

Almost surely, 2^{1320121321331} is an apocalyptic number.

1320121321331 is a deficient number, since it is larger than the sum of its proper divisors (3325243021).

1320121321331 is an equidigital number, since it uses as much as digits as its factorization.

1320121321331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325243020.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1320121321331 its reverse (1331231210231), we get a palindrome (2651352531562).

The spelling of 1320121321331 in words is "one trillion, three hundred twenty billion, one hundred twenty-one million, three hundred twenty-one thousand, three hundred thirty-one".