4400040021 has 16 divisors (see below), whose sum is σ = 6319346880. Its totient is φ = 2707142400.

The previous prime is 4400039929. The next prime is 4400040023. The reversal of 4400040021 is 1200400044.

It is not a de Polignac number, because 4400040021 - 2⁹ = 4400039509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4400040023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242845 + ... + 260333.

It is an arithmetic number, because the mean of its divisors is an integer number (394959180).

Almost surely, 2^4400040021 is an apocalyptic number.

It is an amenable number.

4400040021 is a deficient number, since it is larger than the sum of its proper divisors (1919306859).

4400040021 is a wasteful number, since it uses less digits than its factorization.

4400040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23956.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 4400040021 is about 66332.7974760601. The cubic root of 4400040021 is about 1638.6475093766.

Adding to 4400040021 its reverse (1200400044), we get a palindrome (5600440065).

The spelling of 4400040021 in words is "four billion, four hundred million, forty thousand, twenty-one".