211011221011 has 4 divisors (see below), whose sum is σ = 217818034624. Its totient is φ = 204204407400.

The previous prime is 211011220967. The next prime is 211011221021. The reversal of 211011221011 is 110122110112.

It is a happy number.

211011221011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211011221011 - 2⁷ = 211011220883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211011220982 and 211011221000.

It is not an unprimeable number, because it can be changed into a prime (211011221021) 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, 3403406760 + ... + 3403406821.

It is an arithmetic number, because the mean of its divisors is an integer number (54454508656).

Almost surely, 2^211011221011 is an apocalyptic number.

211011221011 is a deficient number, since it is larger than the sum of its proper divisors (6806813613).

211011221011 is an equidigital number, since it uses as much as digits as its factorization.

211011221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6806813612.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211011221011 its reverse (110122110112), we get a palindrome (321133331123).

The spelling of 211011221011 in words is "two hundred eleven billion, eleven million, two hundred twenty-one thousand, eleven".