1323210321 has 12 divisors (see below), whose sum is σ = 1912272180. Its totient is φ = 881693280.

The previous prime is 1323210313. The next prime is 1323210323. The reversal of 1323210321 is 1230123231.

1323210321 is a `hidden beast` number, since 1 + 323 + 21 + 0 + 321 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1314425025 + 8785296 = 36255^2 + 2964^2 .

It is not a de Polignac number, because 1323210321 - 2³ = 1323210313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1323210294 and 1323210303.

It is not an unprimeable number, because it can be changed into a prime (1323210323) 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 11 ways as a sum of consecutive naturals, for example, 17970 + ... + 54491.

It is an arithmetic number, because the mean of its divisors is an integer number (159356015).

Almost surely, 2^1323210321 is an apocalyptic number.

It is an amenable number.

1323210321 is a deficient number, since it is larger than the sum of its proper divisors (589061859).

1323210321 is a wasteful number, since it uses less digits than its factorization.

1323210321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74496 (or 74493 counting only the distinct ones).

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

The square root of 1323210321 is about 36375.9580080030. The cubic root of 1323210321 is about 1097.8498829280.

Adding to 1323210321 its reverse (1230123231), we get a palindrome (2553333552).

The spelling of 1323210321 in words is "one billion, three hundred twenty-three million, two hundred ten thousand, three hundred twenty-one".