21424520304 has 160 divisors (see below), whose sum is σ = 67150702080. Its totient is φ = 6486105600.

The previous prime is 21424520231. The next prime is 21424520339. The reversal of 21424520304 is 40302542412.

21424520304 is a `hidden beast` number, since 214 + 245 + 203 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8775724 + ... + 8778164.

It is an arithmetic number, because the mean of its divisors is an integer number (419691888).

Almost surely, 2^21424520304 is an apocalyptic number.

21424520304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21424520304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33575351040).

21424520304 is an abundant number, since it is smaller than the sum of its proper divisors (45726181776).

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

21424520304 is a wasteful number, since it uses less digits than its factorization.

21424520304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4316 (or 4304 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The spelling of 21424520304 in words is "twenty-one billion, four hundred twenty-four million, five hundred twenty thousand, three hundred four".