212012121111 has 24 divisors (see below), whose sum is σ = 333823784832. Its totient is φ = 117241714800.

The previous prime is 212012121089. The next prime is 212012121119. The reversal of 212012121111 is 111121210212.

It is a happy number.

212012121111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212012121111 - 2¹¹ = 212012119063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212012121119) 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 23 ways as a sum of consecutive naturals, for example, 5232585 + ... + 5272946.

It is an arithmetic number, because the mean of its divisors is an integer number (13909324368).

Almost surely, 2^212012121111 is an apocalyptic number.

212012121111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212012121111 is a deficient number, since it is larger than the sum of its proper divisors (121811663721).

212012121111 is a wasteful number, since it uses less digits than its factorization.

212012121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505603 (or 10505572 counting only the distinct ones).

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

Adding to 212012121111 its reverse (111121210212), we get a palindrome (323133331323).

The spelling of 212012121111 in words is "two hundred twelve billion, twelve million, one hundred twenty-one thousand, one hundred eleven".