21304446004 has 12 divisors (see below), whose sum is σ = 37631218464. Its totient is φ = 10552669304.

The previous prime is 21304445959. The next prime is 21304446013. The reversal of 21304446004 is 40064440312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24887944 + ... + 24888799.

It is an arithmetic number, because the mean of its divisors is an integer number (3135934872).

Almost surely, 2^21304446004 is an apocalyptic number.

It is an amenable number.

21304446004 is a deficient number, since it is larger than the sum of its proper divisors (16326772460).

21304446004 is a wasteful number, since it uses less digits than its factorization.

21304446004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49776854 (or 49776852 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21304446004 its reverse (40064440312), we get a palindrome (61368886316).

The spelling of 21304446004 in words is "twenty-one billion, three hundred four million, four hundred forty-six thousand, four".