222220112221 has 4 divisors (see below), whose sum is σ = 222473499772. Its totient is φ = 221966724672.

The previous prime is 222220112209. The next prime is 222220112237. The reversal of 222220112221 is 122211022222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 136891860121 + 85328252100 = 369989^2 + 292110^2 .

It is a cyclic number.

It is not a de Polignac number, because 222220112221 - 2¹⁵ = 222220079453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222220112281) 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 3 ways as a sum of consecutive naturals, for example, 126692460 + ... + 126694213.

It is an arithmetic number, because the mean of its divisors is an integer number (55618374943).

Almost surely, 2^222220112221 is an apocalyptic number.

It is an amenable number.

222220112221 is a deficient number, since it is larger than the sum of its proper divisors (253387551).

222220112221 is an equidigital number, since it uses as much as digits as its factorization.

222220112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253387550.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 222220112221 its reverse (122211022222), we get a palindrome (344431134443).

The spelling of 222220112221 in words is "two hundred twenty-two billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-one".