212120212111 has 4 divisors (see below), whose sum is σ = 212121733824. Its totient is φ = 212118690400.

The previous prime is 212120212079. The next prime is 212120212133. The reversal of 212120212111 is 111212021212.

212120212111 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 212120212111 - 2⁵ = 212120212079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120212211) 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, 528010 + ... + 838471.

It is an arithmetic number, because the mean of its divisors is an integer number (53030433456).

Almost surely, 2^212120212111 is an apocalyptic number.

212120212111 is a deficient number, since it is larger than the sum of its proper divisors (1521713).

212120212111 is a wasteful number, since it uses less digits than its factorization.

212120212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521712.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212120212111 its reverse (111212021212), we get a palindrome (323332233323).

It can be divided in two parts, 21212021211 and 1, that added together give a palindrome (21212021212).

The spelling of 212120212111 in words is "two hundred twelve billion, one hundred twenty million, two hundred twelve thousand, one hundred eleven".