131221320312 has 64 divisors (see below), whose sum is σ = 329738117760. Its totient is φ = 43515964800.

The previous prime is 131221320311. The next prime is 131221320319. The reversal of 131221320312 is 213023122131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221320311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23509362 + ... + 23514942.

It is an arithmetic number, because the mean of its divisors is an integer number (5152158090).

Almost surely, 2^131221320312 is an apocalyptic number.

131221320312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131221320312 is an abundant number, since it is smaller than the sum of its proper divisors (198516797448).

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

131221320312 is a wasteful number, since it uses less digits than its factorization.

131221320312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10444 (or 10440 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 131221320312 its reverse (213023122131), we get a palindrome (344244442443).

The spelling of 131221320312 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred twenty thousand, three hundred twelve".