1211211100011 has 24 divisors (see below), whose sum is σ = 1776054993552. Its totient is φ = 733675835200.

The previous prime is 1211211099991. The next prime is 1211211100063. The reversal of 1211211100011 is 1100011121121.

It is not a de Polignac number, because 1211211100011 - 2⁶ = 1211211099947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211211100011.

It is not an unprimeable number, because it can be changed into a prime (1211211100511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207480 + ... + 1570181.

It is an arithmetic number, because the mean of its divisors is an integer number (74002291398).

Almost surely, 2^{1211211100011} is an apocalyptic number.

1211211100011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211211100011 is a deficient number, since it is larger than the sum of its proper divisors (564843893541).

1211211100011 is a wasteful number, since it uses less digits than its factorization.

1211211100011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779563 (or 1779552 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1211211100011 its reverse (1100011121121), we get a palindrome (2311222221132).

It can be divided in two parts, 121121 and 1100011, that multiplied together give a palindrome (133234432331).

The spelling of 1211211100011 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred thousand, eleven".