211111213212 has 18 divisors (see below), whose sum is σ = 533642233488. Its totient is φ = 70370404392.

The previous prime is 211111213147. The next prime is 211111213217. The reversal of 211111213212 is 212312111112.

It is a happy number.

211111213212 is a `hidden beast` number, since 211 + 11 + 121 + 321 + 2 = 666.

211111213212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111213217) 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 5 ways as a sum of consecutive naturals, for example, 2932100148 + ... + 2932100219.

Almost surely, 2^211111213212 is an apocalyptic number.

It is an amenable number.

211111213212 is an abundant number, since it is smaller than the sum of its proper divisors (322531020276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211111213212 is a wasteful number, since it uses less digits than its factorization.

211111213212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5864200377 (or 5864200372 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 211111213212 its reverse (212312111112), we get a palindrome (423423324324).

The spelling of 211111213212 in words is "two hundred eleven billion, one hundred eleven million, two hundred thirteen thousand, two hundred twelve".