12421604315556 has 72 divisors (see below), whose sum is σ = 32166974767200. Its totient is φ = 4039283790720.

The previous prime is 12421604315551. The next prime is 12421604315567. The reversal of 12421604315556 is 65551340612421.

12421604315556 is a `hidden beast` number, since 1 + 2 + 4 + 2 + 1 + 60 + 4 + 31 + 5 + 556 = 666.

It is not an unprimeable number, because it can be changed into a prime (12421604315551) 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, 23142555 + ... + 23673213.

Almost surely, 2^{12421604315556} is an apocalyptic number.

It is an amenable number.

12421604315556 is an abundant number, since it is smaller than the sum of its proper divisors (19745370451644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12421604315556 is a wasteful number, since it uses less digits than its factorization.

12421604315556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546569 (or 546564 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

Adding to 12421604315556 its reverse (65551340612421), we get a palindrome (77972944927977).

The spelling of 12421604315556 in words is "twelve trillion, four hundred twenty-one billion, six hundred four million, three hundred fifteen thousand, five hundred fifty-six".