4406002021 has 4 divisors (see below), whose sum is σ = 4407650572. Its totient is φ = 4404353472.

The previous prime is 4406002019. The next prime is 4406002031. The reversal of 4406002021 is 1202006044.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1929844900 + 2476157121 = 43930^2 + 49761^2 .

It is a cyclic number.

It is not a de Polignac number, because 4406002021 - 2¹ = 4406002019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4406002021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4406002031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820260 + ... + 825613.

It is an arithmetic number, because the mean of its divisors is an integer number (1101912643).

Almost surely, 2^4406002021 is an apocalyptic number.

It is an amenable number.

4406002021 is a deficient number, since it is larger than the sum of its proper divisors (1648551).

4406002021 is a wasteful number, since it uses less digits than its factorization.

4406002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648550.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 4406002021 is about 66377.7223245872. The cubic root of 4406002021 is about 1639.3872910720.

Adding to 4406002021 its reverse (1202006044), we get a palindrome (5608008065).

The spelling of 4406002021 in words is "four billion, four hundred six million, two thousand, twenty-one".