12609090621 has 24 divisors (see below), whose sum is σ = 19805702904. Its totient is φ = 7697756160.

The previous prime is 12609090619. The next prime is 12609090623.

12609090621 is a `hidden beast` number, since 1 + 26 + 0 + 9 + 0 + 9 + 0 + 621 = 666.

12609090621 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (12609090619) and next prime (12609090623).

It can be written as a sum of positive squares in 4 ways, for example, as 6222843225 + 6386247396 = 78885^2 + 79914^2 .

It is not a de Polignac number, because 12609090621 - 2¹ = 12609090619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12609090623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1108020 + ... + 1119341.

It is an arithmetic number, because the mean of its divisors is an integer number (825237621).

Almost surely, 2^12609090621 is an apocalyptic number.

It is an amenable number.

12609090621 is a deficient number, since it is larger than the sum of its proper divisors (7196612283).

12609090621 is a wasteful number, since it uses less digits than its factorization.

12609090621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227421 (or 2227418 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The spelling of 12609090621 in words is "twelve billion, six hundred nine million, ninety thousand, six hundred twenty-one".