1231324231321 has 4 divisors (see below), whose sum is σ = 1237704149812. Its totient is φ = 1224944312832.

The previous prime is 1231324231271. The next prime is 1231324231327.

1231324231321 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 198684147600 + 1032640083721 = 445740^2 + 1016189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231324231321 - 2¹⁷ = 1231324100249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231324231321.

It is not an unprimeable number, because it can be changed into a prime (1231324231327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3189958956 + ... + 3189959341.

It is an arithmetic number, because the mean of its divisors is an integer number (309426037453).

Almost surely, 2^{1231324231321} is an apocalyptic number.

It is an amenable number.

1231324231321 is a deficient number, since it is larger than the sum of its proper divisors (6379918491).

1231324231321 is an equidigital number, since it uses as much as digits as its factorization.

1231324231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6379918490.

The product of its digits is 5184, while the sum is 28.

The spelling of 1231324231321 in words is "one trillion, two hundred thirty-one billion, three hundred twenty-four million, two hundred thirty-one thousand, three hundred twenty-one".