12020001221 has 2 divisors, whose sum is σ = 12020001222. Its totient is φ = 12020001220.

The previous prime is 12020001199. The next prime is 12020001251. The reversal of 12020001221 is 12210002021.

It is a happy number.

12020001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11468268100 + 551733121 = 107090^2 + 23489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12020001221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12020001251) 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, 6010000610 + 6010000611.

It is an arithmetic number, because the mean of its divisors is an integer number (6010000611).

Almost surely, 2^12020001221 is an apocalyptic number.

It is an amenable number.

12020001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12020001221 is an equidigital number, since it uses as much as digits as its factorization.

12020001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12020001221 its reverse (12210002021), we get a palindrome (24230003242).

The spelling of 12020001221 in words is "twelve billion, twenty million, one thousand, two hundred twenty-one".