12321425520656 has 160 divisors (see below), whose sum is σ = 29398118400000. Its totient is φ = 4886358174720.

The previous prime is 12321425520529. The next prime is 12321425520667. The reversal of 12321425520656 is 65602552412321.

It is a happy number.

It is a super-2 number, since 2×12321425520656² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 239462420 + ... + 239513868.

It is an arithmetic number, because the mean of its divisors is an integer number (183738240000).

Almost surely, 2^{12321425520656} is an apocalyptic number.

12321425520656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12321425520656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14699059200000).

12321425520656 is an abundant number, since it is smaller than the sum of its proper divisors (17076692879344).

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

12321425520656 is a wasteful number, since it uses less digits than its factorization.

12321425520656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54517 (or 54511 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 44.

Adding to 12321425520656 its reverse (65602552412321), we get a palindrome (77923977932977).

The spelling of 12321425520656 in words is "twelve trillion, three hundred twenty-one billion, four hundred twenty-five million, five hundred twenty thousand, six hundred fifty-six".