21354462062568 has 24 divisors (see below), whose sum is σ = 57835001419650. Its totient is φ = 7118154020832.

The previous prime is 21354462062477. The next prime is 21354462062569. The reversal of 21354462062568 is 86526026445312.

21354462062568 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 4 + 4 + 6 + 2 + 0 + 625 + 6 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18120874087044 + 3233587975524 = 4256862^2 + 1798218^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (21354462062569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148294875363 + ... + 148294875506.

Almost surely, 2^{21354462062568} is an apocalyptic number.

It is an amenable number.

21354462062568 is an abundant number, since it is smaller than the sum of its proper divisors (36480539357082).

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

21354462062568 is a wasteful number, since it uses less digits than its factorization.

21354462062568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296589750881 (or 296589750874 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 54.

The spelling of 21354462062568 in words is "twenty-one trillion, three hundred fifty-four billion, four hundred sixty-two million, sixty-two thousand, five hundred sixty-eight".