131211323321 has 8 divisors (see below), whose sum is σ = 141611025864. Its totient is φ = 120855409920.

The previous prime is 131211323279. The next prime is 131211323351. The reversal of 131211323321 is 123323112131.

It can be written as a sum of positive squares in 4 ways, for example, as 17210553721 + 114000769600 = 131189^2 + 337640^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131211323321 is a prime.

It is a super-2 number, since 2×131211323321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131211323351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10941056 + ... + 10953041.

It is an arithmetic number, because the mean of its divisors is an integer number (17701378233).

Almost surely, 2^131211323321 is an apocalyptic number.

It is an amenable number.

131211323321 is a deficient number, since it is larger than the sum of its proper divisors (10399702543).

131211323321 is a wasteful number, since it uses less digits than its factorization.

131211323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21894571.

The product of its digits is 648, while the sum is 23.

Adding to 131211323321 its reverse (123323112131), we get a palindrome (254534435452).

The spelling of 131211323321 in words is "one hundred thirty-one billion, two hundred eleven million, three hundred twenty-three thousand, three hundred twenty-one".