12009491021 has 8 divisors (see below), whose sum is σ = 13103100000. Its totient is φ = 10916188240.

The previous prime is 12009490981. The next prime is 12009491077. The reversal of 12009491021 is 12019490021.

12009491021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12009491021 - 2¹⁴ = 12009474637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12009491321) 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 in 7 ways as a sum of consecutive naturals, for example, 9695 + ... + 155283.

It is an arithmetic number, because the mean of its divisors is an integer number (1637887500).

Almost surely, 2^12009491021 is an apocalyptic number.

12009491021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12009491021 is a deficient number, since it is larger than the sum of its proper divisors (1093608979).

12009491021 is a wasteful number, since it uses less digits than its factorization.

12009491021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153099.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 12009491021 in words is "twelve billion, nine million, four hundred ninety-one thousand, twenty-one".