12120122221221 has 32 divisors (see below), whose sum is σ = 18579981127680. Its totient is φ = 6884078155776.

The previous prime is 12120122221189. The next prime is 12120122221243. The reversal of 12120122221221 is 12212222102121.

12120122221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12120122221221 - 2⁵ = 12120122221189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120122221121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205364965 + ... + 205423973.

It is an arithmetic number, because the mean of its divisors is an integer number (580624410240).

Almost surely, 2^{12120122221221} is an apocalyptic number.

It is an amenable number.

12120122221221 is a deficient number, since it is larger than the sum of its proper divisors (6459858906459).

12120122221221 is a wasteful number, since it uses less digits than its factorization.

12120122221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117753.

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

Adding to 12120122221221 its reverse (12212222102121), we get a palindrome (24332344323342).

The spelling of 12120122221221 in words is "twelve trillion, one hundred twenty billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".