222122212221 has 64 divisors (see below), whose sum is σ = 374566201856. Its totient is φ = 113933952000.

The previous prime is 222122212189. The next prime is 222122212237. The reversal of 222122212221 is 122212221222.

It is not a de Polignac number, because 222122212221 - 2⁵ = 222122212189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

222122212221 is a modest number, since divided by 22212221 gives 2221 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222122212121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22429371 + ... + 22439271.

It is an arithmetic number, because the mean of its divisors is an integer number (5852596904).

Almost surely, 2^222122212221 is an apocalyptic number.

222122212221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222122212221 is a deficient number, since it is larger than the sum of its proper divisors (152443989635).

222122212221 is a wasteful number, since it uses less digits than its factorization.

222122212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12182.

The product of its digits is 512, while the sum is 21.

Adding to 222122212221 its reverse (122212221222), we get a palindrome (344334433443).

Subtracting from 222122212221 its reverse (122212221222), we obtain a palindrome (99909990999).

The spelling of 222122212221 in words is "two hundred twenty-two billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".