1222111201221 has 32 divisors (see below), whose sum is σ = 1827429542400. Its totient is φ = 807140635200.

The previous prime is 1222111201219. The next prime is 1222111201231. The reversal of 1222111201221 is 1221021112221.

1222111201221 is a `hidden beast` number, since 12 + 221 + 11 + 201 + 221 = 666.

It is not a de Polignac number, because 1222111201221 - 2¹ = 1222111201219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222111201194 and 1222111201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222111201231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21299271 + ... + 21356571.

It is an arithmetic number, because the mean of its divisors is an integer number (57107173200).

Almost surely, 2^{1222111201221} is an apocalyptic number.

It is an amenable number.

1222111201221 is a deficient number, since it is larger than the sum of its proper divisors (605318341179).

1222111201221 is a wasteful number, since it uses less digits than its factorization.

1222111201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64666 (or 64660 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1222111201221 its reverse (1221021112221), we get a palindrome (2443132313442).

The spelling of 1222111201221 in words is "one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".