1222200111221 has 16 divisors (see below), whose sum is σ = 1272258883584. Its totient is φ = 1173399986304.

The previous prime is 1222200111199. The next prime is 1222200111227. The reversal of 1222200111221 is 1221110022221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222200111221 is a prime.

It is a super-2 number, since 2×1222200111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222200111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222200111227) 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 15 ways as a sum of consecutive naturals, for example, 752321 + ... + 1735046.

It is an arithmetic number, because the mean of its divisors is an integer number (79516180224).

Almost surely, 2^{1222200111221} is an apocalyptic number.

It is an amenable number.

1222200111221 is a deficient number, since it is larger than the sum of its proper divisors (50058772363).

1222200111221 is a wasteful number, since it uses less digits than its factorization.

1222200111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487620.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1222200111221 its reverse (1221110022221), we get a palindrome (2443310133442).

The spelling of 1222200111221 in words is "one trillion, two hundred twenty-two billion, two hundred million, one hundred eleven thousand, two hundred twenty-one".