131221112 has 24 divisors (see below), whose sum is σ = 270442200. Its totient is φ = 59645520.

The previous prime is 131221093. The next prime is 131221117. The reversal of 131221112 is 211122131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66812 + ... + 68747.

It is an arithmetic number, because the mean of its divisors is an integer number (11268425).

Almost surely, 2^131221112 is an apocalyptic number.

It is an amenable number.

131221112 is an abundant number, since it is smaller than the sum of its proper divisors (139221088).

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

131221112 is a wasteful number, since it uses less digits than its factorization.

131221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135587 (or 135572 counting only the distinct ones).

The product of its digits is 24, while the sum is 14.

The square root of 131221112 is about 11455.1783923255. The cubic root of 131221112 is about 508.1608910266.

Adding to 131221112 its reverse (211122131), we get a palindrome (342343243).

The spelling of 131221112 in words is "one hundred thirty-one million, two hundred twenty-one thousand, one hundred twelve".