1222222222221 has 192 divisors, whose sum is σ = 2286842976768. Its totient is φ = 564537600000.

The previous prime is 1222222222217. The next prime is 1222222222231.

1222222222221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1222222222221 - 2² = 1222222222217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1222222222191 and 1222222222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222222222211) 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 191 ways as a sum of consecutive naturals, for example, 123439371 + ... + 123449271.

It is an arithmetic number, because the mean of its divisors is an integer number (11910640504).

Almost surely, 2^{1222222222221} is an apocalyptic number.

1222222222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222222222221 is a deficient number, since it is larger than the sum of its proper divisors (1064620754547).

1222222222221 is a wasteful number, since it uses less digits than its factorization.

1222222222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10084 (or 10073 counting only the distinct ones).

The product of its digits is 2048, while the sum is 24.

It can be divided in two parts, 1 and 222222222221, that added together give a palindrome (222222222222).

The spelling of 1222222222221 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".