131221201313 has 4 divisors (see below), whose sum is σ = 131223858708. Its totient is φ = 131218543920.

The previous prime is 131221201303. The next prime is 131221201333. The reversal of 131221201313 is 313102122131.

It is a happy number.

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 110042802529 + 21178398784 = 331727^2 + 145528^2 .

It is a cyclic number.

It is not a de Polignac number, because 131221201313 - 2¹⁰ = 131221200289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221201303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1253198 + ... + 1353863.

It is an arithmetic number, because the mean of its divisors is an integer number (32805964677).

Almost surely, 2^131221201313 is an apocalyptic number.

It is an amenable number.

131221201313 is a deficient number, since it is larger than the sum of its proper divisors (2657395).

131221201313 is an equidigital number, since it uses as much as digits as its factorization.

131221201313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657394.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 131221201313 its reverse (313102122131), we get a palindrome (444323323444).

The spelling of 131221201313 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred one thousand, three hundred thirteen".