221213133 has 8 divisors (see below), whose sum is σ = 327723200. Its totient is φ = 147475404.

The previous prime is 221213123. The next prime is 221213147. The reversal of 221213133 is 331312122.

It is not a de Polignac number, because 221213133 - 2¹⁷ = 221082061 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 (221213123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4096513 + ... + 4096566.

It is an arithmetic number, because the mean of its divisors is an integer number (40965400).

Almost surely, 2^221213133 is an apocalyptic number.

It is an amenable number.

221213133 is a deficient number, since it is larger than the sum of its proper divisors (106510067).

221213133 is an equidigital number, since it uses as much as digits as its factorization.

221213133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8193088 (or 8193082 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 221213133 is about 14873.2354583661. The cubic root of 221213133 is about 604.7886546357.

Adding to 221213133 its reverse (331312122), we get a palindrome (552525255).

The spelling of 221213133 in words is "two hundred twenty-one million, two hundred thirteen thousand, one hundred thirty-three".