131566055435221 has 32 divisors (see below), whose sum is σ = 150211078300800. Its totient is φ = 114132673966080.

The previous prime is 131566055435179. The next prime is 131566055435251. The reversal of 131566055435221 is 122534550665131.

It is not a de Polignac number, because 131566055435221 - 2³⁵ = 131531695696853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131566055435251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62648005 + ... + 64714021.

It is an arithmetic number, because the mean of its divisors is an integer number (4694096196900).

Almost surely, 2^{131566055435221} is an apocalyptic number.

131566055435221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131566055435221 is a deficient number, since it is larger than the sum of its proper divisors (18645022865579).

131566055435221 is a wasteful number, since it uses less digits than its factorization.

131566055435221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068389.

The product of its (nonzero) digits is 3240000, while the sum is 49.

The spelling of 131566055435221 in words is "one hundred thirty-one trillion, five hundred sixty-six billion, fifty-five million, four hundred thirty-five thousand, two hundred twenty-one".