21404322304 has 40 divisors (see below), whose sum is σ = 42817619988. Its totient is φ = 10689454080.

The previous prime is 21404322287. The next prime is 21404322319. The reversal of 21404322304 is 40322340412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21362745600 + 41576704 = 146160^2 + 6448^2 .

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, 414394 + ... + 463174.

Almost surely, 2^21404322304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21404322304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21408809994).

21404322304 is an abundant number, since it is smaller than the sum of its proper divisors (21413297684).

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

21404322304 is an frugal number, since it uses more digits than its factorization.

21404322304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49656 (or 49640 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21404322304 its reverse (40322340412), we get a palindrome (61726662716).

The spelling of 21404322304 in words is "twenty-one billion, four hundred four million, three hundred twenty-two thousand, three hundred four".