21333563064 has 48 divisors (see below), whose sum is σ = 63030984120. Its totient is φ = 6464715840.

The previous prime is 21333563057. The next prime is 21333563077. The reversal of 21333563064 is 46036533312.

21333563064 is a `hidden beast` number, since 2 + 1 + 3 + 33 + 563 + 0 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 13467367 + ... + 13468950.

Almost surely, 2^21333563064 is an apocalyptic number.

21333563064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21333563064 is an abundant number, since it is smaller than the sum of its proper divisors (41697421056).

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

21333563064 is a wasteful number, since it uses less digits than its factorization.

21333563064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26936340 (or 26936333 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 36.

The spelling of 21333563064 in words is "twenty-one billion, three hundred thirty-three million, five hundred sixty-three thousand, sixty-four".