131320221331 has 4 divisors (see below), whose sum is σ = 141421776832. Its totient is φ = 121218665832.

The previous prime is 131320221323. The next prime is 131320221341. The reversal of 131320221331 is 133122023131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131320221331 - 2³ = 131320221323 is a prime.

It is a super-2 number, since 2×131320221331² (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 (131320221341) 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, 5050777731 + ... + 5050777756.

It is an arithmetic number, because the mean of its divisors is an integer number (35355444208).

Almost surely, 2^131320221331 is an apocalyptic number.

131320221331 is a deficient number, since it is larger than the sum of its proper divisors (10101555501).

131320221331 is a wasteful number, since it uses less digits than its factorization.

131320221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10101555500.

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

Adding to 131320221331 its reverse (133122023131), we get a palindrome (264442244462).

The spelling of 131320221331 in words is "one hundred thirty-one billion, three hundred twenty million, two hundred twenty-one thousand, three hundred thirty-one".