12021021008 has 20 divisors (see below), whose sum is σ = 23638353120. Its totient is φ = 5920800864.

The previous prime is 12021021007. The next prime is 12021021031. The reversal of 12021021008 is 80012012021.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021021007) 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 in 3 ways as a sum of consecutive naturals, for example, 5605748 + ... + 5607891.

It is an arithmetic number, because the mean of its divisors is an integer number (1181917656).

Almost surely, 2^12021021008 is an apocalyptic number.

It is an amenable number.

12021021008 is a deficient number, since it is larger than the sum of its proper divisors (11617332112).

12021021008 is a wasteful number, since it uses less digits than its factorization.

12021021008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11213714 (or 11213708 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12021021008 its reverse (80012012021), we get a palindrome (92033033029).

The spelling of 12021021008 in words is "twelve billion, twenty-one million, twenty-one thousand, eight".