21533548068 has 36 divisors (see below), whose sum is σ = 54823634320. Its totient is φ = 7126208496.

The previous prime is 21533548063. The next prime is 21533548079. The reversal of 21533548068 is 86084533512.

21533548068 is a `hidden beast` number, since 2 + 1 + 533 + 54 + 8 + 0 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21533548063) 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 11 ways as a sum of consecutive naturals, for example, 2146630 + ... + 2156637.

Almost surely, 2^21533548068 is an apocalyptic number.

It is an amenable number.

21533548068 is an abundant number, since it is smaller than the sum of its proper divisors (33290086252).

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

21533548068 is a wasteful number, since it uses less digits than its factorization.

21533548068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4303416 (or 4303411 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 21533548068 in words is "twenty-one billion, five hundred thirty-three million, five hundred forty-eight thousand, sixty-eight".