112121221 has 8 divisors (see below), whose sum is σ = 117293400. Its totient is φ = 107036160.

The previous prime is 112121213. The next prime is 112121237. The reversal of 112121221 is 122121211.

It can be written as a sum of positive squares in 4 ways, for example, as 2604996 + 109516225 = 1614^2 + 10465^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 112121221 - 2³ = 112121213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112121201) 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, 19140 + ... + 24301.

It is an arithmetic number, because the mean of its divisors is an integer number (14661675).

Almost surely, 2^112121221 is an apocalyptic number.

It is an amenable number.

112121221 is a deficient number, since it is larger than the sum of its proper divisors (5172179).

112121221 is an equidigital number, since it uses as much as digits as its factorization.

112121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43559.

The product of its digits is 16, while the sum is 13.

The square root of 112121221 is about 10588.7308493511. The cubic root of 112121221 is about 482.2022948078.

Adding to 112121221 its reverse (122121211), we get a palindrome (234242432).

The spelling of 112121221 in words is "one hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".