131310020021 has 4 divisors (see below), whose sum is σ = 131312180844. Its totient is φ = 131307859200.

The previous prime is 131310019937. The next prime is 131310020041. The reversal of 131310020021 is 120020013131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120020013131 = 97 ⋅1237319723.

It can be written as a sum of positive squares in 2 ways, for example, as 98363776900 + 32946243121 = 313630^2 + 181511^2 .

It is a cyclic number.

It is not a de Polignac number, because 131310020021 - 2¹⁸ = 131309757877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131310019978 and 131310020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131310020041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 986540 + ... + 1111701.

It is an arithmetic number, because the mean of its divisors is an integer number (32828045211).

Almost surely, 2^131310020021 is an apocalyptic number.

It is an amenable number.

131310020021 is a deficient number, since it is larger than the sum of its proper divisors (2160823).

131310020021 is an equidigital number, since it uses as much as digits as its factorization.

131310020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160822.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 131310020021 its reverse (120020013131), we get a palindrome (251330033152).

The spelling of 131310020021 in words is "one hundred thirty-one billion, three hundred ten million, twenty thousand, twenty-one".