222112221211121 has 4 divisors (see below), whose sum is σ = 222112577606052. Its totient is φ = 222111864816192.

The previous prime is 222112221211087. The next prime is 222112221211163. The reversal of 222112221211121 is 121112122211222.

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 96329513857600 + 125782707353521 = 9814760^2 + 11215289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222112221211121 is a prime.

It is a super-2 number, since 2×222112221211121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222112221211021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177260996 + ... + 178509621.

It is an arithmetic number, because the mean of its divisors is an integer number (55528144401513).

Almost surely, 2^{222112221211121} is an apocalyptic number.

It is an amenable number.

222112221211121 is a deficient number, since it is larger than the sum of its proper divisors (356394931).

222112221211121 is an equidigital number, since it uses as much as digits as its factorization.

222112221211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356394930.

The product of its digits is 256, while the sum is 23.

Adding to 222112221211121 its reverse (121112122211222), we get a palindrome (343224343422343).

The spelling of 222112221211121 in words is "two hundred twenty-two trillion, one hundred twelve billion, two hundred twenty-one million, two hundred eleven thousand, one hundred twenty-one".