21534970676608 has 64 divisors (see below), whose sum is σ = 45017086694400. Its totient is φ = 10241795373568.

The previous prime is 21534970676603. The next prime is 21534970676617. The reversal of 21534970676608 is 80667607943512.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a self number, because there is not a number n which added to its sum of digits gives 21534970676608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534970676603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19905616 + ... + 20959567.

It is an arithmetic number, because the mean of its divisors is an integer number (703391979600).

It is a 1-persistent number, because it is pandigital, but 2⋅21534970676608 = 43069941353216 is not.

Almost surely, 2^{21534970676608} is an apocalyptic number.

It is an amenable number.

21534970676608 is an abundant number, since it is smaller than the sum of its proper divisors (23482116017792).

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

21534970676608 is a wasteful number, since it uses less digits than its factorization.

21534970676608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40865399 (or 40865387 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 64.

The spelling of 21534970676608 in words is "twenty-one trillion, five hundred thirty-four billion, nine hundred seventy million, six hundred seventy-six thousand, six hundred eight".