212212221212 has 24 divisors (see below), whose sum is σ = 393695814960. Its totient is φ = 99742910720.

The previous prime is 212212221203. The next prime is 212212221223. The reversal of 212212221212 is 212122212212.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1844762 + ... + 1956417.

It is an arithmetic number, because the mean of its divisors is an integer number (16403992290).

Almost surely, 2^212212221212 is an apocalyptic number.

It is an amenable number.

212212221212 is a deficient number, since it is larger than the sum of its proper divisors (181483593748).

212212221212 is a wasteful number, since it uses less digits than its factorization.

212212221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3802021 (or 3802019 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

Adding to 212212221212 its reverse (212122212212), we get a palindrome (424334433424).

The spelling of 212212221212 in words is "two hundred twelve billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twelve".