131221213112 has 32 divisors (see below), whose sum is σ = 268748219520. Its totient is φ = 59570185440.

The previous prime is 131221213111. The next prime is 131221213133. The reversal of 131221213112 is 211312122131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221213111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 878108 + ... + 1016619.

It is an arithmetic number, because the mean of its divisors is an integer number (8398381860).

Almost surely, 2^131221213112 is an apocalyptic number.

It is an amenable number.

131221213112 is an abundant number, since it is smaller than the sum of its proper divisors (137527006408).

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

131221213112 is a wasteful number, since it uses less digits than its factorization.

131221213112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895531 (or 1895527 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 131221213112 its reverse (211312122131), we get a palindrome (342533335243).

The spelling of 131221213112 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred thirteen thousand, one hundred twelve".