21534561585672 has 32 divisors (see below), whose sum is σ = 54115349074080. Its totient is φ = 7140994513920.

The previous prime is 21534561585643. The next prime is 21534561585737. The reversal of 21534561585672 is 27658516543512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2324537854 + ... + 2324547117.

It is an arithmetic number, because the mean of its divisors is an integer number (1691104658565).

Almost surely, 2^{21534561585672} is an apocalyptic number.

It is an amenable number.

21534561585672 is an abundant number, since it is smaller than the sum of its proper divisors (32580787488408).

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

21534561585672 is a wasteful number, since it uses less digits than its factorization.

21534561585672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4649085173 (or 4649085169 counting only the distinct ones).

The product of its digits is 60480000, while the sum is 60.

The spelling of 21534561585672 in words is "twenty-one trillion, five hundred thirty-four billion, five hundred sixty-one million, five hundred eighty-five thousand, six hundred seventy-two".