112131221 has 4 divisors (see below), whose sum is σ = 113014272. Its totient is φ = 111248172.

The previous prime is 112131203. The next prime is 112131277. The reversal of 112131221 is 122131211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122131211 = 61 ⋅2002151.

It is a cyclic number.

It is not a de Polignac number, because 112131221 - 2⁶ = 112131157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 112131196 and 112131205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112131121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441335 + ... + 441588.

It is an arithmetic number, because the mean of its divisors is an integer number (28253568).

Almost surely, 2^112131221 is an apocalyptic number.

It is an amenable number.

112131221 is a deficient number, since it is larger than the sum of its proper divisors (883051).

112131221 is an equidigital number, since it uses as much as digits as its factorization.

112131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883050.

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

The square root of 112131221 is about 10589.2030389449. The cubic root of 112131221 is about 482.2166301244.

Adding to 112131221 its reverse (122131211), we get a palindrome (234262432).

The spelling of 112131221 in words is "one hundred twelve million, one hundred thirty-one thousand, two hundred twenty-one".