1211200122211 has 4 divisors (see below), whose sum is σ = 1212492759352. Its totient is φ = 1209907485072.

The previous prime is 1211200122203. The next prime is 1211200122239. The reversal of 1211200122211 is 1122210021121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211200122211 - 2³ = 1211200122203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211200122241) 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 3 ways as a sum of consecutive naturals, for example, 646317165 + ... + 646319038.

It is an arithmetic number, because the mean of its divisors is an integer number (303123189838).

Almost surely, 2^{1211200122211} is an apocalyptic number.

1211200122211 is a deficient number, since it is larger than the sum of its proper divisors (1292637141).

1211200122211 is an equidigital number, since it uses as much as digits as its factorization.

1211200122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292637140.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211200122211 its reverse (1122210021121), we get a palindrome (2333410143332).

The spelling of 1211200122211 in words is "one trillion, two hundred eleven billion, two hundred million, one hundred twenty-two thousand, two hundred eleven".