222121101212121 has 16 divisors (see below), whose sum is σ = 304250159379584. Its totient is φ = 144038607727104.

The previous prime is 222121101212063. The next prime is 222121101212149. The reversal of 222121101212121 is 121212101121222.

It is not a de Polignac number, because 222121101212121 - 2⁷ = 222121101211993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121101212191) 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 15 ways as a sum of consecutive naturals, for example, 276989560 + ... + 277790313.

It is an arithmetic number, because the mean of its divisors is an integer number (19015634961224).

Almost surely, 2^{222121101212121} is an apocalyptic number.

It is an amenable number.

222121101212121 is a deficient number, since it is larger than the sum of its proper divisors (82129058167463).

222121101212121 is a wasteful number, since it uses less digits than its factorization.

222121101212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554783520.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 222121101212121 its reverse (121212101121222), we get a palindrome (343333202333343).

It can be divided in two parts, 222121101 and 212121, that added together give a palindrome (222333222).

The spelling of 222121101212121 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred one million, two hundred twelve thousand, one hundred twenty-one".