4221021840 has 80 divisors (see below), whose sum is σ = 14954483328. Its totient is φ = 964804608.

The previous prime is 4221021829. The next prime is 4221021859. The reversal of 4221021840 is 481201224.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 4221021840.

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 15 ways as a sum of consecutive naturals, for example, 1254577 + ... + 1257936.

Almost surely, 2^4221021840 is an apocalyptic number.

4221021840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4221021840 is an abundant number, since it is smaller than the sum of its proper divisors (10733461488).

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

4221021840 is a wasteful number, since it uses less digits than its factorization.

4221021840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512536 (or 2512530 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 4221021840 is about 64969.3915624889. The cubic root of 4221021840 is about 1616.1160117511.

The spelling of 4221021840 in words is "four billion, two hundred twenty-one million, twenty-one thousand, eight hundred forty".