221322233 has 4 divisors (see below), whose sum is σ = 241442448. Its totient is φ = 201202020.

The previous prime is 221322193. The next prime is 221322293. The reversal of 221322233 is 332223122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221322233 - 2¹⁰ = 221321209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221322293) 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, 10060091 + ... + 10060112.

It is an arithmetic number, because the mean of its divisors is an integer number (60360612).

Almost surely, 2^221322233 is an apocalyptic number.

It is an amenable number.

221322233 is a deficient number, since it is larger than the sum of its proper divisors (20120215).

221322233 is a wasteful number, since it uses less digits than its factorization.

221322233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20120214.

The product of its digits is 864, while the sum is 20.

The square root of 221322233 is about 14876.9026682304. The cubic root of 221322233 is about 604.8880634381. Note that the first 3 decimals are identical.

Adding to 221322233 its reverse (332223122), we get a palindrome (553545355).

The spelling of 221322233 in words is "two hundred twenty-one million, three hundred twenty-two thousand, two hundred thirty-three".