221321222 has 4 divisors (see below), whose sum is σ = 331981836. Its totient is φ = 110660610.

The previous prime is 221321209. The next prime is 221321251. The reversal of 221321222 is 222123122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221321222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55330304 + ... + 55330307.

It is an arithmetic number, because the mean of its divisors is an integer number (82995459).

Almost surely, 2^221321222 is an apocalyptic number.

221321222 is a deficient number, since it is larger than the sum of its proper divisors (110660614).

221321222 is a wasteful number, since it uses less digits than its factorization.

221321222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110660613.

The product of its digits is 192, while the sum is 17.

The square root of 221321222 is about 14876.8686893445. The cubic root of 221321222 is about 604.8871423938.

Adding to 221321222 its reverse (222123122), we get a palindrome (443444344).

The spelling of 221321222 in words is "two hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty-two".