112217521 has 6 divisors (see below), whose sum is σ = 121513830. Its totient is φ = 103585248.

The previous prime is 112217509. The next prime is 112217531. The reversal of 112217521 is 125712211.

It can be written as a sum of positive squares in 3 ways, for example, as 703921 + 111513600 = 839^2 + 10560^2 .

It is not a de Polignac number, because 112217521 - 2⁷ = 112217393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 112217492 and 112217501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112217531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 331836 + ... + 332173.

It is an arithmetic number, because the mean of its divisors is an integer number (20252305).

Almost surely, 2^112217521 is an apocalyptic number.

It is an amenable number.

112217521 is a deficient number, since it is larger than the sum of its proper divisors (9296309).

112217521 is an equidigital number, since it uses as much as digits as its factorization.

112217521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664035 (or 664022 counting only the distinct ones).

The product of its digits is 280, while the sum is 22.

The square root of 112217521 is about 10593.2771605391. The cubic root of 112217521 is about 482.3403085052.

Adding to 112217521 its reverse (125712211), we get a palindrome (237929732).

The spelling of 112217521 in words is "one hundred twelve million, two hundred seventeen thousand, five hundred twenty-one".