113221221 has 8 divisors (see below), whose sum is σ = 155041824. Its totient is φ = 73440720.

The previous prime is 113221217. The next prime is 113221253. The reversal of 113221221 is 122122311.

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

It is not a de Polignac number, because 113221221 - 2² = 113221217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 113221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113221201) 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, 509895 + ... + 510116.

It is an arithmetic number, because the mean of its divisors is an integer number (19380228).

Almost surely, 2^113221221 is an apocalyptic number.

It is an amenable number.

113221221 is a deficient number, since it is larger than the sum of its proper divisors (41820603).

113221221 is a wasteful number, since it uses less digits than its factorization.

113221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020051.

The product of its digits is 48, while the sum is 15.

The square root of 113221221 is about 10640.5460856105. The cubic root of 113221221 is about 483.7740974448.

Adding to 113221221 its reverse (122122311), we get a palindrome (235343532).

The spelling of 113221221 in words is "one hundred thirteen million, two hundred twenty-one thousand, two hundred twenty-one".