4402440021 has 16 divisors (see below), whose sum is σ = 6710183424. Its totient is φ = 2515041264.

The previous prime is 4402440019. The next prime is 4402440047. The reversal of 4402440021 is 1200442044.

It is not a de Polignac number, because 4402440021 - 2¹ = 4402440019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 4402440021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4402442021) 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, 65470 + ... + 114416.

It is an arithmetic number, because the mean of its divisors is an integer number (419386464).

Almost surely, 2^4402440021 is an apocalyptic number.

It is an amenable number.

4402440021 is a deficient number, since it is larger than the sum of its proper divisors (2307743403).

4402440021 is a wasteful number, since it uses less digits than its factorization.

4402440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53240.

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 4402440021 is about 66350.8856082570. The cubic root of 4402440021 is about 1638.9453884247.

Adding to 4402440021 its reverse (1200442044), we get a palindrome (5602882065).

The spelling of 4402440021 in words is "four billion, four hundred two million, four hundred forty thousand, twenty-one".