1312002321 has 16 divisors (see below), whose sum is σ = 2041780224. Its totient is φ = 733763664.

The previous prime is 1312002287. The next prime is 1312002323. The reversal of 1312002321 is 1232002131.

It is not a de Polignac number, because 1312002321 - 2¹⁰ = 1312001297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1312002321.

It is not an unprimeable number, because it can be changed into a prime (1312002323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 663655 + ... + 665628.

It is an arithmetic number, because the mean of its divisors is an integer number (127611264).

Almost surely, 2^1312002321 is an apocalyptic number.

It is an amenable number.

1312002321 is a deficient number, since it is larger than the sum of its proper divisors (729777903).

1312002321 is a wasteful number, since it uses less digits than its factorization.

1312002321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329340.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1312002321 is about 36221.5725914820. The cubic root of 1312002321 is about 1094.7413805115.

Adding to 1312002321 its reverse (1232002131), we get a palindrome (2544004452).

The spelling of 1312002321 in words is "one billion, three hundred twelve million, two thousand, three hundred twenty-one".