221623222 has 8 divisors (see below), whose sum is σ = 332560296. Its totient is φ = 110769792.

The previous prime is 221623219. The next prime is 221623231. The reversal of 221623222 is 222326122.

It is a happy number.

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

It is a super-2 number, since 2×221623222² = 98233705059322568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221623193 and 221623202.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13803 + ... + 25174.

It is an arithmetic number, because the mean of its divisors is an integer number (41570037).

Almost surely, 2^221623222 is an apocalyptic number.

221623222 is a deficient number, since it is larger than the sum of its proper divisors (110937074).

221623222 is a wasteful number, since it uses less digits than its factorization.

221623222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41822.

The product of its digits is 1152, while the sum is 22.

The square root of 221623222 is about 14887.0152146090. The cubic root of 221623222 is about 605.1621467355.

Adding to 221623222 its reverse (222326122), we get a palindrome (443949344).

The spelling of 221623222 in words is "two hundred twenty-one million, six hundred twenty-three thousand, two hundred twenty-two".