212121111212 has 12 divisors (see below), whose sum is σ = 371217450576. Its totient is φ = 106058982480.

The previous prime is 212121111211. The next prime is 212121111217. The reversal of 212121111212 is 212111121212.

212121111212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (212121111211) 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, 58163 + ... + 653930.

It is an arithmetic number, because the mean of its divisors is an integer number (30934787548).

Almost surely, 2^212121111212 is an apocalyptic number.

It is an amenable number.

212121111212 is a deficient number, since it is larger than the sum of its proper divisors (159096339364).

212121111212 is a wasteful number, since it uses less digits than its factorization.

212121111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786568 (or 786566 counting only the distinct ones).

The product of its digits is 32, while the sum is 17.

Adding to 212121111212 its reverse (212111121212), we get a palindrome (424232232424).

The spelling of 212121111212 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twelve".