222222222222221 has 16 divisors (see below), whose sum is σ = 241144668959040. Its totient is φ = 203561000348160.

The previous prime is 222222222222151. The next prime is 222222222222227. The reversal of 222222222222221 is 122222222222222.

It is a de Polignac number, because none of the positive numbers 2^k-222222222222221 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222222222227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335164925 + ... + 335827293.

It is an arithmetic number, because the mean of its divisors is an integer number (15071541809940).

Almost surely, 2^{222222222222221} is an apocalyptic number.

It is an amenable number.

222222222222221 is a deficient number, since it is larger than the sum of its proper divisors (18922446736819).

222222222222221 is a wasteful number, since it uses less digits than its factorization.

222222222222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859516.

The product of its digits is 16384, while the sum is 29.

Adding to 222222222222221 its reverse (122222222222222), we get a palindrome (344444444444443).

Subtracting from 222222222222221 its reverse (122222222222222), we obtain a palindrome (99999999999999).

The spelling of 222222222222221 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".