222321204221 has 2 divisors, whose sum is σ = 222321204222. Its totient is φ = 222321204220.

The previous prime is 222321204197. The next prime is 222321204223. The reversal of 222321204221 is 122402123222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214263448996 + 8057755225 = 462886^2 + 89765^2 .

It is a cyclic number.

It is not a de Polignac number, because 222321204221 - 2¹⁰ = 222321203197 is a prime.

Together with 222321204223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222321204223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111160602110 + 111160602111.

It is an arithmetic number, because the mean of its divisors is an integer number (111160602111).

Almost surely, 2^222321204221 is an apocalyptic number.

It is an amenable number.

222321204221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222321204221 is an equidigital number, since it uses as much as digits as its factorization.

222321204221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 222321204221 its reverse (122402123222), we get a palindrome (344723327443).

The spelling of 222321204221 in words is "two hundred twenty-two billion, three hundred twenty-one million, two hundred four thousand, two hundred twenty-one".