131221113 has 16 divisors (see below), whose sum is σ = 185489856. Its totient is φ = 82229760.

The previous prime is 131221093. The next prime is 131221117. The reversal of 131221113 is 311122131.

It is a happy number.

It is not a de Polignac number, because 131221113 - 2⁸ = 131220857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131221092 and 131221101.

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 15 ways as a sum of consecutive naturals, for example, 64845 + ... + 66837.

It is an arithmetic number, because the mean of its divisors is an integer number (11593116).

Almost surely, 2^131221113 is an apocalyptic number.

It is an amenable number.

131221113 is a deficient number, since it is larger than the sum of its proper divisors (54268743).

131221113 is a wasteful number, since it uses less digits than its factorization.

131221113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304.

The product of its digits is 36, while the sum is 15.

The square root of 131221113 is about 11455.1784359738. The cubic root of 131221113 is about 508.1608923175.

Adding to 131221113 its reverse (311122131), we get a palindrome (442343244).

The spelling of 131221113 in words is "one hundred thirty-one million, two hundred twenty-one thousand, one hundred thirteen".