12021666829 has 2 divisors, whose sum is σ = 12021666830. Its totient is φ = 12021666828.

The previous prime is 12021666827. The next prime is 12021666857. The reversal of 12021666829 is 92866612021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8963355625 + 3058311204 = 94675^2 + 55302^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021666829 - 2¹ = 12021666827 is a prime.

Together with 12021666827, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021666823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010833414 + 6010833415.

It is an arithmetic number, because the mean of its divisors is an integer number (6010833415).

Almost surely, 2^12021666829 is an apocalyptic number.

It is an amenable number.

12021666829 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021666829 is an equidigital number, since it uses as much as digits as its factorization.

12021666829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 12021666829 in words is "twelve billion, twenty-one million, six hundred sixty-six thousand, eight hundred twenty-nine".