221113211 has 4 divisors (see below), whose sum is σ = 241214424. Its totient is φ = 201012000.

The previous prime is 221113201. The next prime is 221113213. The reversal of 221113211 is 112311122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221113211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221113213) 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 3 ways as a sum of consecutive naturals, for example, 10050590 + ... + 10050611.

It is an arithmetic number, because the mean of its divisors is an integer number (60303606).

Almost surely, 2^221113211 is an apocalyptic number.

221113211 is a deficient number, since it is larger than the sum of its proper divisors (20101213).

221113211 is a wasteful number, since it uses less digits than its factorization.

221113211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20101212.

The product of its digits is 24, while the sum is 14.

The square root of 221113211 is about 14869.8759577879. The cubic root of 221113211 is about 604.6975798844.

Adding to 221113211 its reverse (112311122), we get a palindrome (333424333).

The spelling of 221113211 in words is "two hundred twenty-one million, one hundred thirteen thousand, two hundred eleven".