12020211221 has 2 divisors, whose sum is σ = 12020211222. Its totient is φ = 12020211220.

The previous prime is 12020211211. The next prime is 12020211227. The reversal of 12020211221 is 12211202021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11052316900 + 967894321 = 105130^2 + 31111^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020211221 - 2¹⁸ = 12019949077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12020211196 and 12020211205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12020211227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010105610 + 6010105611.

It is an arithmetic number, because the mean of its divisors is an integer number (6010105611).

Almost surely, 2^12020211221 is an apocalyptic number.

It is an amenable number.

12020211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12020211221 is an equidigital number, since it uses as much as digits as its factorization.

12020211221 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 14.

Adding to 12020211221 its reverse (12211202021), we get a palindrome (24231413242).

It can be divided in two parts, 1202021 and 1221, that multiplied together give a palindrome (1467667641).

The spelling of 12020211221 in words is "twelve billion, twenty million, two hundred eleven thousand, two hundred twenty-one".