4439824821 has 12 divisors (see below), whose sum is σ = 6427896748. Its totient is φ = 2953044864.

The previous prime is 4439824819. The next prime is 4439824843. The reversal of 4439824821 is 1284289344.

It can be written as a sum of positive squares in 2 ways, for example, as 2531096100 + 1908728721 = 50310^2 + 43689^2 .

It is not a de Polignac number, because 4439824821 - 2¹ = 4439824819 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4439824811) 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, 565750 + ... + 573543.

Almost surely, 2^4439824821 is an apocalyptic number.

It is an amenable number.

4439824821 is a deficient number, since it is larger than the sum of its proper divisors (1988071927).

4439824821 is a wasteful number, since it uses less digits than its factorization.

4439824821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139732 (or 1139729 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 4439824821 is about 66632.0104829503. The cubic root of 4439824821 is about 1643.5715368499.

The spelling of 4439824821 in words is "four billion, four hundred thirty-nine million, eight hundred twenty-four thousand, eight hundred twenty-one".