221222110212 has 72 divisors (see below), whose sum is σ = 578565187200. Its totient is φ = 71187818688.

The previous prime is 221222110211. The next prime is 221222110267. The reversal of 221222110212 is 212011222122.

It is a happy number.

221222110212 is a `hidden beast` number, since 221 + 2 + 221 + 10 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221222110211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11765883 + ... + 11784669.

It is an arithmetic number, because the mean of its divisors is an integer number (8035627600).

Almost surely, 2^221222110212 is an apocalyptic number.

It is an amenable number.

221222110212 is an abundant number, since it is smaller than the sum of its proper divisors (357343076988).

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

221222110212 is a wasteful number, since it uses less digits than its factorization.

221222110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30105 (or 30100 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221222110212 its reverse (212011222122), we get a palindrome (433233332334).

The spelling of 221222110212 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred ten thousand, two hundred twelve".