21044404002 has 16 divisors (see below), whose sum is σ = 43446511872. Its totient is φ = 6788517360.

The previous prime is 21044403983. The next prime is 21044404013. The reversal of 21044404002 is 20040444012.

21044404002 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 21044404002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56570793 + ... + 56571164.

It is an arithmetic number, because the mean of its divisors is an integer number (2715406992).

Almost surely, 2^21044404002 is an apocalyptic number.

21044404002 is an abundant number, since it is smaller than the sum of its proper divisors (22402107870).

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

21044404002 is a wasteful number, since it uses less digits than its factorization.

21044404002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113141993.

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

Adding to 21044404002 its reverse (20040444012), we get a palindrome (41084848014).

The spelling of 21044404002 in words is "twenty-one billion, forty-four million, four hundred four thousand, two".