131320013221 has 4 divisors (see below), whose sum is σ = 133169590944. Its totient is φ = 129470435500.

The previous prime is 131320013213. The next prime is 131320013249. The reversal of 131320013221 is 122310023131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131320013221 - 2³ = 131320013213 is a prime.

It is a super-2 number, since 2×131320013221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131320013281) 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, 924788755 + ... + 924788896.

It is an arithmetic number, because the mean of its divisors is an integer number (33292397736).

Almost surely, 2^131320013221 is an apocalyptic number.

It is an amenable number.

131320013221 is a deficient number, since it is larger than the sum of its proper divisors (1849577723).

131320013221 is an equidigital number, since it uses as much as digits as its factorization.

131320013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849577722.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 131320013221 its reverse (122310023131), we get a palindrome (253630036352).

The spelling of 131320013221 in words is "one hundred thirty-one billion, three hundred twenty million, thirteen thousand, two hundred twenty-one".