131221230313 has 8 divisors (see below), whose sum is σ = 131978382536. Its totient is φ = 130464432000.

The previous prime is 131221230299. The next prime is 131221230331. The reversal of 131221230313 is 313032122131.

It can be written as a sum of positive squares in 4 ways, for example, as 14177188624 + 117044041689 = 119068^2 + 342117^2 .

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-131221230313 is a prime.

It is a super-2 number, since 2×131221230313² (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 (131221230913) 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, 674095 + ... + 846667.

It is an arithmetic number, because the mean of its divisors is an integer number (16497297817).

Almost surely, 2^131221230313 is an apocalyptic number.

It is an amenable number.

131221230313 is a deficient number, since it is larger than the sum of its proper divisors (757152223).

131221230313 is a wasteful number, since it uses less digits than its factorization.

131221230313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176955.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 131221230313 its reverse (313032122131), we get a palindrome (444253352444).

The spelling of 131221230313 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred thirty thousand, three hundred thirteen".