131075020421 has 2 divisors, whose sum is σ = 131075020422. Its totient is φ = 131075020420.

The previous prime is 131075020393. The next prime is 131075020441. The reversal of 131075020421 is 124020570131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115158422500 + 15916597921 = 339350^2 + 126161^2 .

It is a cyclic number.

It is not a de Polignac number, because 131075020421 - 2⁶ = 131075020357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131075020441) 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 as a sum of consecutive naturals, namely, 65537510210 + 65537510211.

It is an arithmetic number, because the mean of its divisors is an integer number (65537510211).

Almost surely, 2^131075020421 is an apocalyptic number.

It is an amenable number.

131075020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

131075020421 is an equidigital number, since it uses as much as digits as its factorization.

131075020421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 131075020421 its reverse (124020570131), we get a palindrome (255095590552).

The spelling of 131075020421 in words is "one hundred thirty-one billion, seventy-five million, twenty thousand, four hundred twenty-one".