1222221211221 has 8 divisors (see below), whose sum is σ = 1629989076384. Its totient is φ = 814633743440.

The previous prime is 1222221211213. The next prime is 1222221211259. The reversal of 1222221211221 is 1221121222221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1222221211221 - 2³ = 1222221211213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222221211921) 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 7 ways as a sum of consecutive naturals, for example, 45083535 + ... + 45110636.

It is an arithmetic number, because the mean of its divisors is an integer number (203748634548).

Almost surely, 2^{1222221211221} is an apocalyptic number.

It is an amenable number.

1222221211221 is a deficient number, since it is larger than the sum of its proper divisors (407767865163).

1222221211221 is an equidigital number, since it uses as much as digits as its factorization.

1222221211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90198691.

The product of its digits is 256, while the sum is 21.

Adding to 1222221211221 its reverse (1221121222221), we get a palindrome (2443342433442).

The spelling of 1222221211221 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".