1222212101221 has 2 divisors, whose sum is σ = 1222212101222. Its totient is φ = 1222212101220.

The previous prime is 1222212101207. The next prime is 1222212101233. The reversal of 1222212101221 is 1221012122221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1153237584321 + 68974516900 = 1073889^2 + 262630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222212101221 - 2⁵ = 1222212101189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222212101251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611106050610 + 611106050611.

It is an arithmetic number, because the mean of its divisors is an integer number (611106050611).

Almost surely, 2^{1222212101221} is an apocalyptic number.

It is an amenable number.

1222212101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222212101221 is an equidigital number, since it uses as much as digits as its factorization.

1222212101221 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 1222212101221 its reverse (1221012122221), we get a palindrome (2443224223442).

The spelling of 1222212101221 in words is "one trillion, two hundred twenty-two billion, two hundred twelve million, one hundred one thousand, two hundred twenty-one".