1323120321 has 6 divisors (see below), whose sum is σ = 1911173810. Its totient is φ = 882080208.

The previous prime is 1323120313. The next prime is 1323120349. The reversal of 1323120321 is 1230213231.

1323120321 is a `hidden beast` number, since 1 + 32 + 312 + 0 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1261670400 + 61449921 = 35520^2 + 7839^2 .

It is not a de Polignac number, because 1323120321 - 2³ = 1323120313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323120294 and 1323120303.

It is not an unprimeable number, because it can be changed into a prime (1323120521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73506676 + ... + 73506693.

Almost surely, 2^1323120321 is an apocalyptic number.

It is an amenable number.

1323120321 is a deficient number, since it is larger than the sum of its proper divisors (588053489).

1323120321 is a wasteful number, since it uses less digits than its factorization.

1323120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147013375 (or 147013372 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1323120321 is about 36374.7209061458. The cubic root of 1323120321 is about 1097.8249917654.

Adding to 1323120321 its reverse (1230213231), we get a palindrome (2553333552).

The spelling of 1323120321 in words is "one billion, three hundred twenty-three million, one hundred twenty thousand, three hundred twenty-one".