4221065856 has 128 divisors (see below), whose sum is σ = 13056163200. Its totient is φ = 1183223808.

The previous prime is 4221065839. The next prime is 4221065867. The reversal of 4221065856 is 6585601224.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127650 + ... + 157278.

It is an arithmetic number, because the mean of its divisors is an integer number (102001275).

Almost surely, 2^4221065856 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 4221065856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6528081600).

4221065856 is an abundant number, since it is smaller than the sum of its proper divisors (8835097344).

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

4221065856 is a wasteful number, since it uses less digits than its factorization.

4221065856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29706 (or 29694 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 4221065856 is about 64969.7303057355. The cubic root of 4221065856 is about 1616.1216292467.

The spelling of 4221065856 in words is "four billion, two hundred twenty-one million, sixty-five thousand, eight hundred fifty-six".