131376720421 has 4 divisors (see below), whose sum is σ = 131377446144. Its totient is φ = 131375994700.

The previous prime is 131376720407. The next prime is 131376720457. The reversal of 131376720421 is 124027673131.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 131376720421 - 2¹¹ = 131376718373 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 (131376720821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155826 + ... + 535756.

It is an arithmetic number, because the mean of its divisors is an integer number (32844361536).

Almost surely, 2^131376720421 is an apocalyptic number.

It is an amenable number.

131376720421 is a deficient number, since it is larger than the sum of its proper divisors (725723).

131376720421 is an equidigital number, since it uses as much as digits as its factorization.

131376720421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725722.

The product of its (nonzero) digits is 42336, while the sum is 37.

The spelling of 131376720421 in words is "one hundred thirty-one billion, three hundred seventy-six million, seven hundred twenty thousand, four hundred twenty-one".