1231211230321 has 4 divisors (see below), whose sum is σ = 1251395021044. Its totient is φ = 1211027439600.

The previous prime is 1231211230261. The next prime is 1231211230339. The reversal of 1231211230321 is 1230321121321.

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 524668435600 + 706542794721 = 724340^2 + 840561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231211230321 - 2²⁷ = 1231077012593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231211230292 and 1231211230301.

It is not an unprimeable number, because it can be changed into a prime (1231211230721) 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, 10091895270 + ... + 10091895391.

It is an arithmetic number, because the mean of its divisors is an integer number (312848755261).

Almost surely, 2^{1231211230321} is an apocalyptic number.

It is an amenable number.

1231211230321 is a deficient number, since it is larger than the sum of its proper divisors (20183790723).

1231211230321 is an equidigital number, since it uses as much as digits as its factorization.

1231211230321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20183790722.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1231211230321 its reverse (1230321121321), we get a palindrome (2461532351642).

The spelling of 1231211230321 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, two hundred thirty thousand, three hundred twenty-one".