222222110112221 has 4 divisors (see below), whose sum is σ = 222223081621212. Its totient is φ = 222221138603232.

The previous prime is 222222110112173. The next prime is 222222110112257. The reversal of 222222110112221 is 122211011222222.

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 107164007520025 + 115058102592196 = 10352005^2 + 10726514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222222110112221 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 (222222110112271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485411306 + ... + 485868891.

It is an arithmetic number, because the mean of its divisors is an integer number (55555770405303).

Almost surely, 2^{222222110112221} is an apocalyptic number.

It is an amenable number.

222222110112221 is a deficient number, since it is larger than the sum of its proper divisors (971508991).

222222110112221 is an equidigital number, since it uses as much as digits as its factorization.

222222110112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971508990.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 222222110112221 its reverse (122211011222222), we get a palindrome (344433121334443).

The spelling of 222222110112221 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, one hundred ten million, one hundred twelve thousand, two hundred twenty-one".