131042503421 has 4 divisors (see below), whose sum is σ = 133190741244. Its totient is φ = 128894265600.

The previous prime is 131042503391. The next prime is 131042503441. The reversal of 131042503421 is 124305240131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124305240131 = 599 ⋅207521269.

It can be written as a sum of positive squares in 2 ways, for example, as 16535388100 + 114507115321 = 128590^2 + 338389^2 .

It is a cyclic number.

It is not a de Polignac number, because 131042503421 - 2⁶ = 131042503357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131042503441) 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, 1074118820 + ... + 1074118941.

It is an arithmetic number, because the mean of its divisors is an integer number (33297685311).

Almost surely, 2^131042503421 is an apocalyptic number.

It is an amenable number.

131042503421 is a deficient number, since it is larger than the sum of its proper divisors (2148237823).

131042503421 is an equidigital number, since it uses as much as digits as its factorization.

131042503421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148237822.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 131042503421 its reverse (124305240131), we get a palindrome (255347743552).

The spelling of 131042503421 in words is "one hundred thirty-one billion, forty-two million, five hundred three thousand, four hundred twenty-one".