12021221999 has 2 divisors, whose sum is σ = 12021222000. Its totient is φ = 12021221998.

The previous prime is 12021221981. The next prime is 12021222023. The reversal of 12021221999 is 99912212021.

It is a happy number.

12021221999 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 is an emirp because it is prime and its reverse (99912212021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12021221999 - 2⁸ = 12021221743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021221299) 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, 6010610999 + 6010611000.

It is an arithmetic number, because the mean of its divisors is an integer number (6010611000).

Almost surely, 2^12021221999 is an apocalyptic number.

12021221999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021221999 is an equidigital number, since it uses as much as digits as its factorization.

12021221999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 12021221999 in words is "twelve billion, twenty-one million, two hundred twenty-one thousand, nine hundred ninety-nine".