112556821 has 4 divisors (see below), whose sum is σ = 121215052. Its totient is φ = 103898592.

The previous prime is 112556791. The next prime is 112556827. The reversal of 112556821 is 128655211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128655211 = 1877 ⋅68543.

It can be written as a sum of positive squares in 2 ways, for example, as 59120721 + 53436100 = 7689^2 + 7310^2 .

It is a cyclic number.

It is not a de Polignac number, because 112556821 - 2⁷ = 112556693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112556827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4329096 + ... + 4329121.

It is an arithmetic number, because the mean of its divisors is an integer number (30303763).

Almost surely, 2^112556821 is an apocalyptic number.

It is an amenable number.

112556821 is a deficient number, since it is larger than the sum of its proper divisors (8658231).

112556821 is an equidigital number, since it uses as much as digits as its factorization.

112556821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8658230.

The product of its digits is 4800, while the sum is 31.

The square root of 112556821 is about 10609.2799472914. The cubic root of 112556821 is about 482.8259528047.

The spelling of 112556821 in words is "one hundred twelve million, five hundred fifty-six thousand, eight hundred twenty-one".