131387113421 has 4 divisors (see below), whose sum is σ = 131398464192. Its totient is φ = 131375762652.

The previous prime is 131387113391. The next prime is 131387113433. The reversal of 131387113421 is 124311783131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124311783131 = 36821 ⋅3376111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131387113421 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 (131387113471) 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, 5658005 + ... + 5681178.

It is an arithmetic number, because the mean of its divisors is an integer number (32849616048).

Almost surely, 2^131387113421 is an apocalyptic number.

It is an amenable number.

131387113421 is a deficient number, since it is larger than the sum of its proper divisors (11350771).

131387113421 is a wasteful number, since it uses less digits than its factorization.

131387113421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11350770.

The product of its digits is 12096, while the sum is 35.

Adding to 131387113421 its reverse (124311783131), we get a palindrome (255698896552).

The spelling of 131387113421 in words is "one hundred thirty-one billion, three hundred eighty-seven million, one hundred thirteen thousand, four hundred twenty-one".