12012220122021 has 18 divisors (see below), whose sum is σ = 20183798437062. Its totient is φ = 6864125783760.

The previous prime is 12012220122017. The next prime is 12012220122059. The reversal of 12012220122021 is 12022102221021.

It is a happy number.

12012220122021 is a `hidden beast` number, since 1 + 201 + 2 + 220 + 1 + 220 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11897325562500 + 114894559521 = 3449250^2 + 338961^2 .

It is not a de Polignac number, because 12012220122021 - 2² = 12012220122017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12012220121985 and 12012220122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012220102021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13619296750 + ... + 13619297631.

Almost surely, 2^{12012220122021} is an apocalyptic number.

It is an amenable number.

12012220122021 is a deficient number, since it is larger than the sum of its proper divisors (8171578315041).

12012220122021 is a wasteful number, since it uses less digits than its factorization.

12012220122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27238594401 (or 27238594391 counting only the distinct ones).

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

Adding to 12012220122021 its reverse (12022102221021), we get a palindrome (24034322343042).

The spelling of 12012220122021 in words is "twelve trillion, twelve billion, two hundred twenty million, one hundred twenty-two thousand, twenty-one".