1211211202111 has 4 divisors (see below), whose sum is σ = 1211213827800. Its totient is φ = 1211208576424.

The previous prime is 1211211202049. The next prime is 1211211202163. The reversal of 1211211202111 is 1112021121121.

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 1211211202111 - 2¹¹ = 1211211200063 is a prime.

It is a super-2 number, since 2×1211211202111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211211202711) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 417256 + ... + 1611373.

It is an arithmetic number, because the mean of its divisors is an integer number (302803456950).

Almost surely, 2^{1211211202111} is an apocalyptic number.

1211211202111 is a deficient number, since it is larger than the sum of its proper divisors (2625689).

1211211202111 is an equidigital number, since it uses as much as digits as its factorization.

1211211202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625688.

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

Adding to 1211211202111 its reverse (1112021121121), we get a palindrome (2323232323232).

The spelling of 1211211202111 in words is "one trillion, two hundred eleven billion, two hundred eleven million, two hundred two thousand, one hundred eleven".