1222222110221 has 4 divisors (see below), whose sum is σ = 1396825268832. Its totient is φ = 1047618951612.

The previous prime is 1222222110191. The next prime is 1222222110269. The reversal of 1222222110221 is 1220112222221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1222222110221 - 2⁶ = 1222222110157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1222222110193 and 1222222110202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222222110121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87301579295 + ... + 87301579308.

It is an arithmetic number, because the mean of its divisors is an integer number (349206317208).

Almost surely, 2^{1222222110221} is an apocalyptic number.

It is an amenable number.

1222222110221 is a deficient number, since it is larger than the sum of its proper divisors (174603158611).

1222222110221 is an equidigital number, since it uses as much as digits as its factorization.

1222222110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174603158610.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1222222110221 its reverse (1220112222221), we get a palindrome (2442334332442).

The spelling of 1222222110221 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred ten thousand, two hundred twenty-one".