12609821281 has 16 divisors (see below), whose sum is σ = 13457352960. Its totient is φ = 11774280960.

The previous prime is 12609821227. The next prime is 12609821327. The reversal of 12609821281 is 18212890621.

It is a cyclic number.

It is not a de Polignac number, because 12609821281 - 2⁷ = 12609821153 is a prime.

It is a super-2 number, since 2×12609821281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12609821381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1915726 + ... + 1922296.

It is an arithmetic number, because the mean of its divisors is an integer number (841084560).

Almost surely, 2^12609821281 is an apocalyptic number.

It is an amenable number.

12609821281 is a deficient number, since it is larger than the sum of its proper divisors (847531679).

12609821281 is a wasteful number, since it uses less digits than its factorization.

12609821281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7464.

The product of its (nonzero) digits is 27648, while the sum is 40.

The spelling of 12609821281 in words is "twelve billion, six hundred nine million, eight hundred twenty-one thousand, two hundred eighty-one".