12609687021 has 8 divisors (see below), whose sum is σ = 16813757184. Its totient is φ = 8406037440.

The previous prime is 12609686897. The next prime is 12609687037. The reversal of 12609687021 is 12078690621.

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

It is not a de Polignac number, because 12609687021 - 2¹⁹ = 12609162733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12609687221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26860 + ... + 161061.

It is an arithmetic number, because the mean of its divisors is an integer number (2101719648).

Almost surely, 2^12609687021 is an apocalyptic number.

It is an amenable number.

12609687021 is a deficient number, since it is larger than the sum of its proper divisors (4204070163).

12609687021 is a wasteful number, since it uses less digits than its factorization.

12609687021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210291.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 12609687021 in words is "twelve billion, six hundred nine million, six hundred eighty-seven thousand, twenty-one".