1211221100222 has 16 divisors (see below), whose sum is σ = 2076413982720. Its totient is φ = 519086018808.

The previous prime is 1211221100213. The next prime is 1211221100237. The reversal of 1211221100222 is 2220011221121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211221100222.

It is a congruent number.

It is an unprimeable number.

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, 171479 + ... + 1565837.

It is an arithmetic number, because the mean of its divisors is an integer number (129775873920).

Almost surely, 2^{1211221100222} is an apocalyptic number.

1211221100222 is a deficient number, since it is larger than the sum of its proper divisors (865192882498).

1211221100222 is a wasteful number, since it uses less digits than its factorization.

1211221100222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456415.

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

Adding to 1211221100222 its reverse (2220011221121), we get a palindrome (3431232321343).

The spelling of 1211221100222 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred thousand, two hundred twenty-two".