131310021 has 4 divisors (see below), whose sum is σ = 175080032. Its totient is φ = 87540012.

The previous prime is 131309993. The next prime is 131310043. The reversal of 131310021 is 120013131.

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 not a de Polignac number, because 131310021 - 2⁶ = 131309957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131309979 and 131310006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131310061) 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, 21885001 + ... + 21885006.

It is an arithmetic number, because the mean of its divisors is an integer number (43770008).

Almost surely, 2^131310021 is an apocalyptic number.

It is an amenable number.

131310021 is a deficient number, since it is larger than the sum of its proper divisors (43770011).

131310021 is an equidigital number, since it uses as much as digits as its factorization.

131310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43770010.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 131310021 is about 11459.0584691763. The cubic root of 131310021 is about 508.2756334282.

Adding to 131310021 its reverse (120013131), we get a palindrome (251323152).

The spelling of 131310021 in words is "one hundred thirty-one million, three hundred ten thousand, twenty-one".