1211222100111 has 16 divisors (see below), whose sum is σ = 1633143133440. Its totient is φ = 798425344640.

The previous prime is 1211222100089. The next prime is 1211222100113. The reversal of 1211222100111 is 1110012221121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1211222100111 - 2⁶ = 1211222100047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211222100113) 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 15 ways as a sum of consecutive naturals, for example, 4121595 + ... + 4405676.

It is an arithmetic number, because the mean of its divisors is an integer number (102071445840).

Almost surely, 2^{1211222100111} is an apocalyptic number.

1211222100111 is a deficient number, since it is larger than the sum of its proper divisors (421921033329).

1211222100111 is a wasteful number, since it uses less digits than its factorization.

1211222100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8527806.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211222100111 its reverse (1110012221121), we get a palindrome (2321234321232).

The spelling of 1211222100111 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred thousand, one hundred eleven".