12122222220121 has 4 divisors (see below), whose sum is σ = 13054700852452. Its totient is φ = 11189743587792.

The previous prime is 12122222220107. The next prime is 12122222220191. The reversal of 12122222220121 is 12102222222121.

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 5353041104896 + 6769181115225 = 2313664^2 + 2601765^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122222220121 - 2²⁵ = 12122188665689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12122222220092 and 12122222220101.

It is not an unprimeable number, because it can be changed into a prime (12122222220191) 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, 466239316146 + ... + 466239316171.

It is an arithmetic number, because the mean of its divisors is an integer number (3263675213113).

Almost surely, 2^{12122222220121} is an apocalyptic number.

It is an amenable number.

12122222220121 is a deficient number, since it is larger than the sum of its proper divisors (932478632331).

12122222220121 is an equidigital number, since it uses as much as digits as its factorization.

12122222220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932478632330.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 12122222220121 its reverse (12102222222121), we get a palindrome (24224444442242).

It can be divided in two parts, 1212222 and 2220121, that added together give a palindrome (3432343).

The spelling of 12122222220121 in words is "twelve trillion, one hundred twenty-two billion, two hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".