211121011 has 4 divisors (see below), whose sum is σ = 223539912. Its totient is φ = 198702112.

The previous prime is 211121003. The next prime is 211121021. The reversal of 211121011 is 110121112.

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 211121011 - 2³ = 211121003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6209425 + ... + 6209458.

It is an arithmetic number, because the mean of its divisors is an integer number (55884978).

Almost surely, 2^211121011 is an apocalyptic number.

211121011 is a deficient number, since it is larger than the sum of its proper divisors (12418901).

211121011 is a wasteful number, since it uses less digits than its factorization.

211121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12418900.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 211121011 is about 14530.0038196829. The cubic root of 211121011 is about 595.4479699659.

Adding to 211121011 its reverse (110121112), we get a palindrome (321242123).

The spelling of 211121011 in words is "two hundred eleven million, one hundred twenty-one thousand, eleven".