1211100212211 has 32 divisors (see below), whose sum is σ = 1675880693760. Its totient is φ = 777151821600.

The previous prime is 1211100212111. The next prime is 1211100212237. The reversal of 1211100212211 is 1122120011121.

It is a happy number.

It is not a de Polignac number, because 1211100212211 - 2¹⁰ = 1211100211187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211100212251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13346130 + ... + 13436568.

It is an arithmetic number, because the mean of its divisors is an integer number (52371271680).

Almost surely, 2^{1211100212211} is an apocalyptic number.

1211100212211 is a deficient number, since it is larger than the sum of its proper divisors (464780481549).

1211100212211 is a wasteful number, since it uses less digits than its factorization.

1211100212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91247.

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

Adding to 1211100212211 its reverse (1122120011121), we get a palindrome (2333220223332).

The spelling of 1211100212211 in words is "one trillion, two hundred eleven billion, one hundred million, two hundred twelve thousand, two hundred eleven".