1321333120121 has 4 divisors (see below), whose sum is σ = 1510094994432. Its totient is φ = 1132571245812.

The previous prime is 1321333120117. The next prime is 1321333120181. The reversal of 1321333120121 is 1210213331231.

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 1321333120121 - 2² = 1321333120117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321333120181) 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, 94380937145 + ... + 94380937158.

It is an arithmetic number, because the mean of its divisors is an integer number (377523748608).

Almost surely, 2^{1321333120121} is an apocalyptic number.

It is an amenable number.

1321333120121 is a deficient number, since it is larger than the sum of its proper divisors (188761874311).

1321333120121 is an equidigital number, since it uses as much as digits as its factorization.

1321333120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188761874310.

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

Adding to 1321333120121 its reverse (1210213331231), we get a palindrome (2531546451352).

The spelling of 1321333120121 in words is "one trillion, three hundred twenty-one billion, three hundred thirty-three million, one hundred twenty thousand, one hundred twenty-one".