131321220012 has 36 divisors (see below), whose sum is σ = 332027795736. Its totient is φ = 43763594880.

The previous prime is 131321220011. The next prime is 131321220113. The reversal of 131321220012 is 210022123131.

131321220012 is a `hidden beast` number, since 131 + 321 + 2 + 200 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (131321220011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264414 + ... + 576677.

It is an arithmetic number, because the mean of its divisors is an integer number (9222994326).

Almost surely, 2^131321220012 is an apocalyptic number.

131321220012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131321220012 is an abundant number, since it is smaller than the sum of its proper divisors (200706575724).

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

131321220012 is a wasteful number, since it uses less digits than its factorization.

131321220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845438 (or 845433 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 131321220012 its reverse (210022123131), we get a palindrome (341343343143).

The spelling of 131321220012 in words is "one hundred thirty-one billion, three hundred twenty-one million, two hundred twenty thousand, twelve".