212121110211 has 4 divisors (see below), whose sum is σ = 282828146952. Its totient is φ = 141414073472.

The previous prime is 212121110147. The next prime is 212121110219. The reversal of 212121110211 is 112011121212.

It is a happy number.

212121110211 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 212121110211 - 2⁶ = 212121110147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212121110219) 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, 35353518366 + ... + 35353518371.

It is an arithmetic number, because the mean of its divisors is an integer number (70707036738).

Almost surely, 2^212121110211 is an apocalyptic number.

212121110211 is a deficient number, since it is larger than the sum of its proper divisors (70707036741).

212121110211 is an equidigital number, since it uses as much as digits as its factorization.

212121110211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70707036740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212121110211 its reverse (112011121212), we get a palindrome (324132231423).

The spelling of 212121110211 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred ten thousand, two hundred eleven".