221222212222212 has 72 divisors (see below), whose sum is σ = 572734863792000. Its totient is φ = 71964989408448.

The previous prime is 221222212222201. The next prime is 221222212222279. The reversal of 221222212222212 is 212222212222122.

221222212222212 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 2 + 221 + 2 + 222 + 212 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 186724662 + ... + 187905677.

It is an arithmetic number, because the mean of its divisors is an integer number (7954650886000).

Almost surely, 2^{221222212222212} is an apocalyptic number.

It is an amenable number.

221222212222212 is an abundant number, since it is smaller than the sum of its proper divisors (351512651569788).

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

221222212222212 is a wasteful number, since it uses less digits than its factorization.

221222212222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374630745 (or 374630740 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

Adding to 221222212222212 its reverse (212222212222122), we get a palindrome (433444424444334).

The spelling of 221222212222212 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twelve".