12421208646 has 144 divisors (see below), whose sum is σ = 34336493568. Its totient is φ = 3208917600.

The previous prime is 12421208621. The next prime is 12421208707. The reversal of 12421208646 is 64680212421.

12421208646 is a `hidden beast` number, since 1 + 2 + 4 + 2 + 1 + 2 + 0 + 8 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 12421208646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1849731 + ... + 1856433.

It is an arithmetic number, because the mean of its divisors is an integer number (238447872).

Almost surely, 2^12421208646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12421208646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17168246784).

12421208646 is an abundant number, since it is smaller than the sum of its proper divisors (21915284922).

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

12421208646 is a wasteful number, since it uses less digits than its factorization.

12421208646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6927 (or 6917 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 12421208646 in words is "twelve billion, four hundred twenty-one million, two hundred eight thousand, six hundred forty-six".