13123311321 has 8 divisors (see below), whose sum is σ = 17498355840. Its totient is φ = 8748570512.

The previous prime is 13123311317. The next prime is 13123311329. The reversal of 13123311321 is 12311332131.

It is a happy number.

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 13123311321 - 2² = 13123311317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13123311329) 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 7 ways as a sum of consecutive naturals, for example, 59311 + ... + 172523.

It is an arithmetic number, because the mean of its divisors is an integer number (2187294480).

Almost surely, 2^13123311321 is an apocalyptic number.

It is an amenable number.

13123311321 is a deficient number, since it is larger than the sum of its proper divisors (4375044519).

13123311321 is a wasteful number, since it uses less digits than its factorization.

13123311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151855.

The product of its digits is 324, while the sum is 21.

Adding to 13123311321 its reverse (12311332131), we get a palindrome (25434643452).

The spelling of 13123311321 in words is "thirteen billion, one hundred twenty-three million, three hundred eleven thousand, three hundred twenty-one".