131221544832 has 320 divisors, whose sum is σ = 447200028000. Its totient is φ = 37416370176.

The previous prime is 131221544813. The next prime is 131221544833. The reversal of 131221544832 is 238445122131.

131221544832 is a `hidden beast` number, since 1 + 3 + 1 + 22 + 154 + 483 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221544833) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 43036044 + ... + 43039092.

Almost surely, 2^131221544832 is an apocalyptic number.

131221544832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131221544832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223600014000).

131221544832 is an abundant number, since it is smaller than the sum of its proper divisors (315978483168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131221544832 is an equidigital number, since it uses as much as digits as its factorization.

131221544832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675 (or 3654 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

Adding to 131221544832 its reverse (238445122131), we get a palindrome (369666666963).

The spelling of 131221544832 in words is "one hundred thirty-one billion, two hundred twenty-one million, five hundred forty-four thousand, eight hundred thirty-two".