21304127520 has 480 divisors, whose sum is σ = 83601745920. Its totient is φ = 5073684480.

The previous prime is 21304127503. The next prime is 21304127521. The reversal of 21304127520 is 2572140312.

21304127520 is a `hidden beast` number, since 2 + 13 + 0 + 4 + 127 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

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

It is not an unprimeable number, because it can be changed into a prime (21304127521) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5220841 + ... + 5224919.

It is an arithmetic number, because the mean of its divisors is an integer number (174170304).

Almost surely, 2^21304127520 is an apocalyptic number.

21304127520 is a gapful number since it is divisible by the number (20) 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 21304127520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41800872960).

21304127520 is an abundant number, since it is smaller than the sum of its proper divisors (62297618400).

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

21304127520 is a wasteful number, since it uses less digits than its factorization.

21304127520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150 (or 4133 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

Adding to 21304127520 its reverse (2572140312), we get a palindrome (23876267832).

The spelling of 21304127520 in words is "twenty-one billion, three hundred four million, one hundred twenty-seven thousand, five hundred twenty".