21446650368 has 640 divisors, whose sum is σ = 78644966400. Its totient is φ = 5673369600.

The previous prime is 21446650283. The next prime is 21446650369. The reversal of 21446650368 is 86305664412.

21446650368 is a `hidden beast` number, since 21 + 4 + 4 + 66 + 503 + 68 = 666.

It is not an unprimeable number, because it can be changed into a prime (21446650369) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 37559523 + ... + 37560093.

It is an arithmetic number, because the mean of its divisors is an integer number (122882760).

Almost surely, 2^21446650368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21446650368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39322483200).

21446650368 is an abundant number, since it is smaller than the sum of its proper divisors (57198316032).

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

21446650368 is a wasteful number, since it uses less digits than its factorization.

21446650368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 21446650368 in words is "twenty-one billion, four hundred forty-six million, six hundred fifty thousand, three hundred sixty-eight".