21040444002 has 8 divisors (see below), whose sum is σ = 42080888016. Its totient is φ = 7013481332.

The previous prime is 21040443997. The next prime is 21040444049. The reversal of 21040444002 is 20044404012.

It is a sphenic number, since it is the product of 3 distinct primes.

21040444002 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21040444002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1753370328 + ... + 1753370339.

It is an arithmetic number, because the mean of its divisors is an integer number (5260111002).

Almost surely, 2^21040444002 is an apocalyptic number.

21040444002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21040444002 is a wasteful number, since it uses less digits than its factorization.

21040444002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506740672.

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

Adding to 21040444002 its reverse (20044404012), we get a palindrome (41084848014).

The spelling of 21040444002 in words is "twenty-one billion, forty million, four hundred forty-four thousand, two".