12021122011221 has 6 divisors (see below), whose sum is σ = 17363842905110. Its totient is φ = 8014081340808.

The previous prime is 12021122011219. The next prime is 12021122011229. The reversal of 12021122011221 is 12211022112021.

12021122011221 is a `hidden beast` number, since 1 + 2 + 0 + 211 + 220 + 11 + 221 = 666.

12021122011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10849447822500 + 1171674188721 = 3293850^2 + 1082439^2 .

It is not a de Polignac number, because 12021122011221 - 2¹ = 12021122011219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021122011194 and 12021122011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021122011229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667840111726 + ... + 667840111743.

Almost surely, 2^{12021122011221} is an apocalyptic number.

It is an amenable number.

12021122011221 is a deficient number, since it is larger than the sum of its proper divisors (5342720893889).

12021122011221 is a wasteful number, since it uses less digits than its factorization.

12021122011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335680223475 (or 1335680223472 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12021122011221 its reverse (12211022112021), we get a palindrome (24232144123242).

The spelling of 12021122011221 in words is "twelve trillion, twenty-one billion, one hundred twenty-two million, eleven thousand, two hundred twenty-one".