222221010101221 has 2 divisors, whose sum is σ = 222221010101222. Its totient is φ = 222221010101220.

The previous prime is 222221010101219. The next prime is 222221010101227. The reversal of 222221010101221 is 122101010122222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175498508332225 + 46722501768996 = 13247585^2 + 6835386^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221010101221 - 2¹ = 222221010101219 is a prime.

Together with 222221010101219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222221010101227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110505050610 + 111110505050611.

It is an arithmetic number, because the mean of its divisors is an integer number (111110505050611).

Almost surely, 2^{222221010101221} is an apocalyptic number.

It is an amenable number.

222221010101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221010101221 is an equidigital number, since it uses as much as digits as its factorization.

222221010101221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 222221010101221 its reverse (122101010122222), we get a palindrome (344322020223443).

The spelling of 222221010101221 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, ten million, one hundred one thousand, two hundred twenty-one".