212221212 has 48 divisors (see below), whose sum is σ = 572302080. Its totient is φ = 59951232.

The previous prime is 212221181. The next prime is 212221223. The reversal of 212221212 is 212122212.

212221212 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 a junction number, because it is equal to n+sod(n) for n = 212221191 and 212221200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6718 + ... + 21669.

It is an arithmetic number, because the mean of its divisors is an integer number (11922960).

Almost surely, 2^212221212 is an apocalyptic number.

It is an amenable number.

212221212 is an abundant number, since it is smaller than the sum of its proper divisors (360080868).

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

212221212 is a wasteful number, since it uses less digits than its factorization.

212221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28490 (or 28488 counting only the distinct ones).

The product of its digits is 64, while the sum is 15.

The square root of 212221212 is about 14567.8142492276. The cubic root of 212221212 is about 596.4805179987.

Adding to 212221212 its reverse (212122212), we get a palindrome (424343424).

The spelling of 212221212 in words is "two hundred twelve million, two hundred twenty-one thousand, two hundred twelve".