1222211210221 has 2 divisors, whose sum is σ = 1222211210222. Its totient is φ = 1222211210220.

The previous prime is 1222211210179. The next prime is 1222211210267. The reversal of 1222211210221 is 1220121122221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887420520900 + 334790689321 = 942030^2 + 578611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222211210221 - 2¹⁷ = 1222211079149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222211210291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611105605110 + 611105605111.

It is an arithmetic number, because the mean of its divisors is an integer number (611105605111).

Almost surely, 2^{1222211210221} is an apocalyptic number.

It is an amenable number.

1222211210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222211210221 is an equidigital number, since it uses as much as digits as its factorization.

1222211210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1222211210221 its reverse (1220121122221), we get a palindrome (2442332332442).

The spelling of 1222211210221 in words is "one trillion, two hundred twenty-two billion, two hundred eleven million, two hundred ten thousand, two hundred twenty-one".