6441221444 has 24 divisors (see below), whose sum is σ = 12890129280. Its totient is φ = 2758876416.

The previous prime is 6441221441. The next prime is 6441221467. The reversal of 6441221444 is 4441221446.

It is a self number, because there is not a number n which added to its sum of digits gives 6441221444.

It is not an unprimeable number, because it can be changed into a prime (6441221441) 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, 20264 + ... + 115295.

It is an arithmetic number, because the mean of its divisors is an integer number (537088720).

Almost surely, 2^6441221444 is an apocalyptic number.

It is an amenable number.

6441221444 is an abundant number, since it is smaller than the sum of its proper divisors (6448907836).

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

6441221444 is a wasteful number, since it uses less digits than its factorization.

6441221444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137267 (or 137265 counting only the distinct ones).

The product of its digits is 24576, while the sum is 32.

The square root of 6441221444 is about 80257.2205100575. The cubic root of 6441221444 is about 1860.6131100152.

The spelling of 6441221444 in words is "six billion, four hundred forty-one million, two hundred twenty-one thousand, four hundred forty-four".