4481818221 has 4 divisors (see below), whose sum is σ = 5975757632. Its totient is φ = 2987878812.

The previous prime is 4481818217. The next prime is 4481818223. The reversal of 4481818221 is 1228181844.

4481818221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4481818221 - 2² = 4481818217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4481818221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4481818223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746969701 + ... + 746969706.

It is an arithmetic number, because the mean of its divisors is an integer number (1493939408).

Almost surely, 2^4481818221 is an apocalyptic number.

It is an amenable number.

4481818221 is a deficient number, since it is larger than the sum of its proper divisors (1493939411).

4481818221 is a wasteful number, since it uses less digits than its factorization.

4481818221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493939410.

The product of its digits is 32768, while the sum is 39.

The square root of 4481818221 is about 66946.3831808709. The cubic root of 4481818221 is about 1648.7371078391.

The spelling of 4481818221 in words is "four billion, four hundred eighty-one million, eight hundred eighteen thousand, two hundred twenty-one".