113221021 has 16 divisors (see below), whose sum is σ = 120575488. Its totient is φ = 106142400.

The previous prime is 113221013. The next prime is 113221027. The reversal of 113221021 is 120122311.

It is a cyclic number.

It is not a de Polignac number, because 113221021 - 2³ = 113221013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113220992 and 113221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113221027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209011 + ... + 209551.

It is an arithmetic number, because the mean of its divisors is an integer number (7535968).

Almost surely, 2^113221021 is an apocalyptic number.

It is an amenable number.

113221021 is a deficient number, since it is larger than the sum of its proper divisors (7354467).

113221021 is a wasteful number, since it uses less digits than its factorization.

113221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 113221021 is about 10640.5366875924. The cubic root of 113221021 is about 483.7738125899.

Adding to 113221021 its reverse (120122311), we get a palindrome (233343332).

The spelling of 113221021 in words is "one hundred thirteen million, two hundred twenty-one thousand, twenty-one".