1320323123221 has 4 divisors (see below), whose sum is σ = 1362914191744. Its totient is φ = 1277732054700.

The previous prime is 1320323123131. The next prime is 1320323123261. The reversal of 1320323123221 is 1223213230231.

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 1320323123221 - 2⁹ = 1320323122709 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 (1320323123261) 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, 21295534215 + ... + 21295534276.

It is an arithmetic number, because the mean of its divisors is an integer number (340728547936).

Almost surely, 2^{1320323123221} is an apocalyptic number.

It is an amenable number.

1320323123221 is a deficient number, since it is larger than the sum of its proper divisors (42591068523).

1320323123221 is an equidigital number, since it uses as much as digits as its factorization.

1320323123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42591068522.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 1320323123221 its reverse (1223213230231), we get a palindrome (2543536353452).

The spelling of 1320323123221 in words is "one trillion, three hundred twenty billion, three hundred twenty-three million, one hundred twenty-three thousand, two hundred twenty-one".