21029444884 has 12 divisors (see below), whose sum is σ = 42058889824. Its totient is φ = 9012619224.

The previous prime is 21029444879. The next prime is 21029444903. The reversal of 21029444884 is 48844492012.

21029444884 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375525774 + ... + 375525829.

Almost surely, 2^21029444884 is an apocalyptic number.

It is an amenable number.

21029444884 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.

21029444884 is a wasteful number, since it uses less digits than its factorization.

21029444884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751051614 (or 751051612 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 46.

The spelling of 21029444884 in words is "twenty-one billion, twenty-nine million, four hundred forty-four thousand, eight hundred eighty-four".