4438447821 has 12 divisors (see below), whose sum is σ = 6421008672. Its totient is φ = 2954387976.

The previous prime is 4438447807. The next prime is 4438447829. The reversal of 4438447821 is 1287448344.

It is not a de Polignac number, because 4438447821 - 2⁵ = 4438447789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4438447829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375291 + ... + 386936.

It is an arithmetic number, because the mean of its divisors is an integer number (535084056).

Almost surely, 2^4438447821 is an apocalyptic number.

It is an amenable number.

4438447821 is a deficient number, since it is larger than the sum of its proper divisors (1982560851).

4438447821 is a wasteful number, since it uses less digits than its factorization.

4438447821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762880 (or 762877 counting only the distinct ones).

The product of its digits is 688128, while the sum is 45.

The square root of 4438447821 is about 66621.6768101794. The cubic root of 4438447821 is about 1643.4016028163.

The spelling of 4438447821 in words is "four billion, four hundred thirty-eight million, four hundred forty-seven thousand, eight hundred twenty-one".