21304055530 has 16 divisors (see below), whose sum is σ = 38561533920. Its totient is φ = 8474014672.

The previous prime is 21304055527. The next prime is 21304055537. The reversal of 21304055530 is 3555040312.

It is a super-3 number, since 3×21304055530³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21304055537) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5949064 + ... + 5952643.

It is an arithmetic number, because the mean of its divisors is an integer number (2410095870).

Almost surely, 2^21304055530 is an apocalyptic number.

21304055530 is a deficient number, since it is larger than the sum of its proper divisors (17257478390).

21304055530 is a wasteful number, since it uses less digits than its factorization.

21304055530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11901893.

The product of its (nonzero) digits is 9000, while the sum is 28.

Adding to 21304055530 its reverse (3555040312), we get a palindrome (24859095842).

The spelling of 21304055530 in words is "twenty-one billion, three hundred four million, fifty-five thousand, five hundred thirty".