12120211022221 has 8 divisors (see below), whose sum is σ = 12418621839288. Its totient is φ = 11821933344000.

The previous prime is 12120211022177. The next prime is 12120211022243. The reversal of 12120211022221 is 12222011202121.

It can be written as a sum of positive squares in 4 ways, for example, as 158220972900 + 11961990049321 = 397770^2 + 3458611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12120211022221 - 2⁷ = 12120211022093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120211022251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33100390 + ... + 33464551.

It is an arithmetic number, because the mean of its divisors is an integer number (1552327729911).

Almost surely, 2^{12120211022221} is an apocalyptic number.

It is an amenable number.

12120211022221 is a deficient number, since it is larger than the sum of its proper divisors (298410817067).

12120211022221 is an equidigital number, since it uses as much as digits as its factorization.

12120211022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66569423.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12120211022221 its reverse (12222011202121), we get a palindrome (24342222224342).

The spelling of 12120211022221 in words is "twelve trillion, one hundred twenty billion, two hundred eleven million, twenty-two thousand, two hundred twenty-one".