221220222222 has 16 divisors (see below), whose sum is σ = 445409845200. Its totient is φ = 73245173952.

The previous prime is 221220222161. The next prime is 221220222241. The reversal of 221220222222 is 222222022122.

221220222222 is a modest number, since divided by 222222 gives 221220 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123724063 + ... + 123725850.

It is an arithmetic number, because the mean of its divisors is an integer number (27838115325).

Almost surely, 2^221220222222 is an apocalyptic number.

221220222222 is an abundant number, since it is smaller than the sum of its proper divisors (224189622978).

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

221220222222 is a wasteful number, since it uses less digits than its factorization.

221220222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247450067.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 221220222222 its reverse (222222022122), we get a palindrome (443442244344).

The spelling of 221220222222 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-two".