12021000605 has 4 divisors (see below), whose sum is σ = 14425200732. Its totient is φ = 9616800480.

The previous prime is 12021000601. The next prime is 12021000619. The reversal of 12021000605 is 50600012021.

12021000605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1549367044 + 10471633561 = 39362^2 + 102331^2 .

It is not a de Polignac number, because 12021000605 - 2² = 12021000601 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 (12021000601) 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 3 ways as a sum of consecutive naturals, for example, 1202100056 + ... + 1202100065.

It is an arithmetic number, because the mean of its divisors is an integer number (3606300183).

Almost surely, 2^12021000605 is an apocalyptic number.

It is an amenable number.

12021000605 is a deficient number, since it is larger than the sum of its proper divisors (2404200127).

12021000605 is an equidigital number, since it uses as much as digits as its factorization.

12021000605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404200126.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 12021000605 its reverse (50600012021), we get a palindrome (62621012626).

The spelling of 12021000605 in words is "twelve billion, twenty-one million, six hundred five", and thus it is an aban number.