222320221 has 4 divisors (see below), whose sum is σ = 222352000. Its totient is φ = 222288444.

The previous prime is 222320209. The next prime is 222320261. The reversal of 222320221 is 122023222.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 222320221 - 2⁹ = 222319709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222320195 and 222320204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222320261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291 + ... + 21088.

It is an arithmetic number, because the mean of its divisors is an integer number (55588000).

Almost surely, 2^222320221 is an apocalyptic number.

It is an amenable number.

222320221 is a deficient number, since it is larger than the sum of its proper divisors (31779).

222320221 is a wasteful number, since it uses less digits than its factorization.

222320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31778.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 222320221 is about 14910.4064666259. The cubic root of 222320221 is about 605.7958889908.

Adding to 222320221 its reverse (122023222), we get a palindrome (344343443).

The spelling of 222320221 in words is "two hundred twenty-two million, three hundred twenty thousand, two hundred twenty-one".