12221200021 has 2 divisors, whose sum is σ = 12221200022. Its totient is φ = 12221200020.

The previous prime is 12221199919. The next prime is 12221200031. The reversal of 12221200021 is 12000212221.

It is a happy number.

12221200021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6385767921 + 5835432100 = 79911^2 + 76390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221200021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221199974 and 12221200010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221200031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110600010 + 6110600011.

It is an arithmetic number, because the mean of its divisors is an integer number (6110600011).

Almost surely, 2^12221200021 is an apocalyptic number.

It is an amenable number.

12221200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221200021 is an equidigital number, since it uses as much as digits as its factorization.

12221200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12221200021 its reverse (12000212221), we get a palindrome (24221412242).

The spelling of 12221200021 in words is "twelve billion, two hundred twenty-one million, two hundred thousand, twenty-one".