4421916021 has 8 divisors (see below), whose sum is σ = 5896236640. Its totient is φ = 2947769712.

The previous prime is 4421916017. The next prime is 4421916029. The reversal of 4421916021 is 1206191244.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4421916021 - 2² = 4421916017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4421916021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4421916029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36795 + ... + 100983.

It is an arithmetic number, because the mean of its divisors is an integer number (737029580).

Almost surely, 2^4421916021 is an apocalyptic number.

It is an amenable number.

4421916021 is a deficient number, since it is larger than the sum of its proper divisors (1474320619).

4421916021 is a wasteful number, since it uses less digits than its factorization.

4421916021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87155.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 4421916021 is about 66497.4888322860. The cubic root of 4421916021 is about 1641.3586823424.

The spelling of 4421916021 in words is "four billion, four hundred twenty-one million, nine hundred sixteen thousand, twenty-one".