1323001321 has 4 divisors (see below), whose sum is σ = 1324283092. Its totient is φ = 1321719552.

The previous prime is 1323001307. The next prime is 1323001349. The reversal of 1323001321 is 1231003231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1231003231 = 617 ⋅1995143.

It can be written as a sum of positive squares in 2 ways, for example, as 888695721 + 434305600 = 29811^2 + 20840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323001321 - 2⁵ = 1323001289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323001295 and 1323001304.

It is not an unprimeable number, because it can be changed into a prime (1323001391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639336 + ... + 641401.

It is an arithmetic number, because the mean of its divisors is an integer number (331070773).

Almost surely, 2^1323001321 is an apocalyptic number.

It is an amenable number.

1323001321 is a deficient number, since it is larger than the sum of its proper divisors (1281771).

1323001321 is a wasteful number, since it uses less digits than its factorization.

1323001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281770.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1323001321 is about 36373.0851179825. The cubic root of 1323001321 is about 1097.7920783842.

Adding to 1323001321 its reverse (1231003231), we get a palindrome (2554004552).

The spelling of 1323001321 in words is "one billion, three hundred twenty-three million, one thousand, three hundred twenty-one".