4215821868 has 18 divisors (see below), whose sum is σ = 10656660924. Its totient is φ = 1405273944.

The previous prime is 4215821849. The next prime is 4215821873. The reversal of 4215821868 is 8681285124.

4215821868 is a `hidden beast` number, since 4 + 2 + 1 + 582 + 1 + 8 + 68 = 666.

4215821868 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58553046 + ... + 58553117.

It is an arithmetic number, because the mean of its divisors is an integer number (592036718).

Almost surely, 2^4215821868 is an apocalyptic number.

It is an amenable number.

4215821868 is an abundant number, since it is smaller than the sum of its proper divisors (6440839056).

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

4215821868 is a wasteful number, since it uses less digits than its factorization.

4215821868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117106173 (or 117106168 counting only the distinct ones).

The product of its digits is 245760, while the sum is 45.

The square root of 4215821868 is about 64929.3606005788. The cubic root of 4215821868 is about 1615.4520957912.

The spelling of 4215821868 in words is "four billion, two hundred fifteen million, eight hundred twenty-one thousand, eight hundred sixty-eight".