22212221212 has 24 divisors (see below), whose sum is σ = 40028767856. Its totient is φ = 10778721408.

The previous prime is 22212221201. The next prime is 22212221221. The reversal of 22212221212 is 21212221222.

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

It is a self number, because there is not a number n which added to its sum of digits gives 22212221212.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 384273 + ... + 438280.

Almost surely, 2^22212221212 is an apocalyptic number.

It is an amenable number.

22212221212 is a deficient number, since it is larger than the sum of its proper divisors (17816546644).

22212221212 is a wasteful number, since it uses less digits than its factorization.

22212221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822757 (or 822755 counting only the distinct ones).

The product of its digits is 256, while the sum is 19.

Adding to 22212221212 its reverse (21212221222), we get a palindrome (43424442434).

The spelling of 22212221212 in words is "twenty-two billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twelve".