12021222221121 has 4 divisors (see below), whose sum is σ = 16028296294832. Its totient is φ = 8014148147412.

The previous prime is 12021222221119. The next prime is 12021222221143. The reversal of 12021222221121 is 12112222212021.

12021222221121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12021222221121 - 2¹ = 12021222221119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021222223121) 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, 2003537036851 + ... + 2003537036856.

It is an arithmetic number, because the mean of its divisors is an integer number (4007074073708).

Almost surely, 2^{12021222221121} is an apocalyptic number.

It is an amenable number.

12021222221121 is a deficient number, since it is larger than the sum of its proper divisors (4007074073711).

12021222221121 is an equidigital number, since it uses as much as digits as its factorization.

12021222221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007074073710.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12021222221121 its reverse (12112222212021), we get a palindrome (24133444433142).

It can be divided in two parts, 1202122 and 2221121, that added together give a palindrome (3423243).

The spelling of 12021222221121 in words is "twelve trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".