21304054512 has 80 divisors (see below), whose sum is σ = 65854430880. Its totient is φ = 6555091968.

The previous prime is 21304054477. The next prime is 21304054517. The reversal of 21304054512 is 21545040312.

21304054512 is a `hidden beast` number, since 213 + 0 + 405 + 45 + 1 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304054517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1891113 + ... + 1902344.

It is an arithmetic number, because the mean of its divisors is an integer number (823180386).

Almost surely, 2^21304054512 is an apocalyptic number.

It is an amenable number.

21304054512 is an abundant number, since it is smaller than the sum of its proper divisors (44550376368).

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

21304054512 is a wasteful number, since it uses less digits than its factorization.

21304054512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793487 (or 3793475 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21304054512 its reverse (21545040312), we get a palindrome (42849094824).

The spelling of 21304054512 in words is "twenty-one billion, three hundred four million, fifty-four thousand, five hundred twelve".