12012021202221 has 6 divisors (see below), whose sum is σ = 17350697292110. Its totient is φ = 8008014134808.

The previous prime is 12012021202213. The next prime is 12012021202289. The reversal of 12012021202221 is 12220212021021.

It is a happy number.

12012021202221 is a `hidden beast` number, since 1 + 201 + 20 + 21 + 202 + 221 = 666.

12012021202221 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., 11210369579721 + 801651622500 = 3348189^2 + 895350^2 .

It is not a de Polignac number, because 12012021202221 - 2³ = 12012021202213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12012021202194 and 12012021202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012021202201) 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, 667334511226 + ... + 667334511243.

Almost surely, 2^{12012021202221} is an apocalyptic number.

It is an amenable number.

12012021202221 is a deficient number, since it is larger than the sum of its proper divisors (5338676089889).

12012021202221 is a wasteful number, since it uses less digits than its factorization.

12012021202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334669022475 (or 1334669022472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12012021202221 its reverse (12220212021021), we get a palindrome (24232233223242).

The spelling of 12012021202221 in words is "twelve trillion, twelve billion, twenty-one million, two hundred two thousand, two hundred twenty-one".