1312123321 has 8 divisors (see below), whose sum is σ = 1316016000. Its totient is φ = 1308237840.

The previous prime is 1312123301. The next prime is 1312123327. The reversal of 1312123321 is 1233212131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1312123321 - 2⁵ = 1312123289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312123327) 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 7 ways as a sum of consecutive naturals, for example, 672255 + ... + 674203.

It is an arithmetic number, because the mean of its divisors is an integer number (164502000).

Almost surely, 2^1312123321 is an apocalyptic number.

It is an amenable number.

1312123321 is a deficient number, since it is larger than the sum of its proper divisors (3892679).

1312123321 is an equidigital number, since it uses as much as digits as its factorization.

1312123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3599.

The product of its digits is 216, while the sum is 19.

The square root of 1312123321 is about 36223.2428283278. The cubic root of 1312123321 is about 1094.7750338145.

Adding to 1312123321 its reverse (1233212131), we get a palindrome (2545335452).

The spelling of 1312123321 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, three hundred twenty-one".