7222212110221 has 2 divisors, whose sum is σ = 7222212110222. Its totient is φ = 7222212110220.

The previous prime is 7222212110173. The next prime is 7222212110227. The reversal of 7222212110221 is 1220112122227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4506538825321 + 2715673284900 = 2122861^2 + 1647930^2 .

It is an emirp because it is prime and its reverse (1220112122227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7222212110221 - 2¹⁵ = 7222212077453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7222212110227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3611106055110 + 3611106055111.

It is an arithmetic number, because the mean of its divisors is an integer number (3611106055111).

Almost surely, 2^{7222212110221} is an apocalyptic number.

It is an amenable number.

7222212110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7222212110221 is an equidigital number, since it uses as much as digits as its factorization.

7222212110221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 7222212110221 its reverse (1220112122227), we get a palindrome (8442324232448).

The spelling of 7222212110221 in words is "seven trillion, two hundred twenty-two billion, two hundred twelve million, one hundred ten thousand, two hundred twenty-one".