131221311985 has 16 divisors (see below), whose sum is σ = 166751436672. Its totient is φ = 98788192000.

The previous prime is 131221311973. The next prime is 131221312009. The reversal of 131221311985 is 589113122131.

It is not a de Polignac number, because 131221311985 - 2¹¹ = 131221309937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 529740 + ... + 736930.

It is an arithmetic number, because the mean of its divisors is an integer number (10421964792).

Almost surely, 2^131221311985 is an apocalyptic number.

It is an amenable number.

131221311985 is a deficient number, since it is larger than the sum of its proper divisors (35530124687).

131221311985 is a wasteful number, since it uses less digits than its factorization.

131221311985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214664.

The product of its digits is 12960, while the sum is 37.

The spelling of 131221311985 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred eleven thousand, nine hundred eighty-five".