131521221012 has 12 divisors (see below), whose sum is σ = 306882849056. Its totient is φ = 43840407000.

The previous prime is 131521220969. The next prime is 131521221017. The reversal of 131521221012 is 210122125131.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 131521221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131521221017) 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, 5480050864 + ... + 5480050887.

Almost surely, 2^131521221012 is an apocalyptic number.

131521221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131521221012 is an abundant number, since it is smaller than the sum of its proper divisors (175361628044).

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

131521221012 is a wasteful number, since it uses less digits than its factorization.

131521221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10960101758 (or 10960101756 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 131521221012 its reverse (210122125131), we get a palindrome (341643346143).

The spelling of 131521221012 in words is "one hundred thirty-one billion, five hundred twenty-one million, two hundred twenty-one thousand, twelve".