1323120220321 has 4 divisors (see below), whose sum is σ = 1323288714132. Its totient is φ = 1322951726512.

The previous prime is 1323120220313. The next prime is 1323120220343. The reversal of 1323120220321 is 1230220213231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 684655298721 + 638464921600 = 827439^2 + 799040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323120220321 - 2³ = 1323120220313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323120220292 and 1323120220301.

It is not an unprimeable number, because it can be changed into a prime (1323120220351) 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, 84235126 + ... + 84250831.

It is an arithmetic number, because the mean of its divisors is an integer number (330822178533).

Almost surely, 2^{1323120220321} is an apocalyptic number.

It is an amenable number.

1323120220321 is a deficient number, since it is larger than the sum of its proper divisors (168493811).

1323120220321 is an equidigital number, since it uses as much as digits as its factorization.

1323120220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168493810.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1323120220321 its reverse (1230220213231), we get a palindrome (2553340433552).

The spelling of 1323120220321 in words is "one trillion, three hundred twenty-three billion, one hundred twenty million, two hundred twenty thousand, three hundred twenty-one".