222111111120121 has 4 divisors (see below), whose sum is σ = 222111598349412. Its totient is φ = 222110623890832.

The previous prime is 222111111120113. The next prime is 222111111120131. The reversal of 222111111120121 is 121021111111222.

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 138031105784896 + 84080005335225 = 11748664^2 + 9169515^2 .

It is a cyclic number.

It is not a de Polignac number, because 222111111120121 - 2³ = 222111111120113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222111111120131) 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, 242930206 + ... + 243842791.

It is an arithmetic number, because the mean of its divisors is an integer number (55527899587353).

Almost surely, 2^{222111111120121} is an apocalyptic number.

It is an amenable number.

222111111120121 is a deficient number, since it is larger than the sum of its proper divisors (487229291).

222111111120121 is an equidigital number, since it uses as much as digits as its factorization.

222111111120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487229290.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 222111111120121 its reverse (121021111111222), we get a palindrome (343132222231343).

It can be divided in two parts, 2221111111201 and 21, that added together give a palindrome (2221111111222).

The spelling of 222111111120121 in words is "two hundred twenty-two trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty thousand, one hundred twenty-one".