222321444123221 has 2 divisors, whose sum is σ = 222321444123222. Its totient is φ = 222321444123220.

The previous prime is 222321444123209. The next prime is 222321444123227. The reversal of 222321444123221 is 122321444123222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154753948320196 + 67567495803025 = 12440014^2 + 8219945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222321444123221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222321444123227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111160722061610 + 111160722061611.

It is an arithmetic number, because the mean of its divisors is an integer number (111160722061611).

Almost surely, 2^{222321444123221} is an apocalyptic number.

It is an amenable number.

222321444123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222321444123221 is an equidigital number, since it uses as much as digits as its factorization.

222321444123221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 35.

Adding to 222321444123221 its reverse (122321444123222), we get a palindrome (344642888246443).

Subtracting from 222321444123221 its reverse (122321444123222), we obtain a palindrome (99999999999999).

The spelling of 222321444123221 in words is "two hundred twenty-two trillion, three hundred twenty-one billion, four hundred forty-four million, one hundred twenty-three thousand, two hundred twenty-one".