21609034272 has 72 divisors (see below), whose sum is σ = 70229367936. Its totient is φ = 6174009216.

The previous prime is 21609034259. The next prime is 21609034301. The reversal of 21609034272 is 27243090612.

21609034272 is a `hidden beast` number, since 2 + 1 + 609 + 0 + 3 + 42 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5357368 + ... + 5361399.

It is an arithmetic number, because the mean of its divisors is an integer number (975407888).

Almost surely, 2^21609034272 is an apocalyptic number.

It is an amenable number.

21609034272 is an abundant number, since it is smaller than the sum of its proper divisors (48620333664).

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

21609034272 is a wasteful number, since it uses less digits than its factorization.

21609034272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10718790 (or 10718779 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The spelling of 21609034272 in words is "twenty-one billion, six hundred nine million, thirty-four thousand, two hundred seventy-two".