211121211011 has 4 divisors (see below), whose sum is σ = 218401252800. Its totient is φ = 203841169224.

The previous prime is 211121210983. The next prime is 211121211023. The reversal of 211121211011 is 110112121112.

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 211121211011 - 2⁶ = 211121210947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121210011) 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, 3640020851 + ... + 3640020908.

It is an arithmetic number, because the mean of its divisors is an integer number (54600313200).

Almost surely, 2^211121211011 is an apocalyptic number.

211121211011 is a deficient number, since it is larger than the sum of its proper divisors (7280041789).

211121211011 is an equidigital number, since it uses as much as digits as its factorization.

211121211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7280041788.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211121211011 its reverse (110112121112), we get a palindrome (321233332123).

The spelling of 211121211011 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred eleven thousand, eleven".