131321151721 has 8 divisors (see below), whose sum is σ = 131506583040. Its totient is φ = 131135790912.

The previous prime is 131321151691. The next prime is 131321151809. The reversal of 131321151721 is 127151123131.

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

It is a cyclic number.

It is not a de Polignac number, because 131321151721 - 2⁷ = 131321151593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131321151721.

It is not an unprimeable number, because it can be changed into a prime (131321151821) 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, 4510216 + ... + 4539238.

It is an arithmetic number, because the mean of its divisors is an integer number (16438322880).

Almost surely, 2^131321151721 is an apocalyptic number.

It is an amenable number.

131321151721 is a deficient number, since it is larger than the sum of its proper divisors (185431319).

131321151721 is an equidigital number, since it uses as much as digits as its factorization.

131321151721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35255.

The product of its digits is 1260, while the sum is 28.

Adding to 131321151721 its reverse (127151123131), we get a palindrome (258472274852).

The spelling of 131321151721 in words is "one hundred thirty-one billion, three hundred twenty-one million, one hundred fifty-one thousand, seven hundred twenty-one".