21295526688 has 54 divisors (see below), whose sum is σ = 60566197419. Its totient is φ = 7097683392.

The previous prime is 21295526597. The next prime is 21295526719. The reversal of 21295526688 is 88662559212.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

21295526688 is a `hidden beast` number, since 2 + 1 + 2 + 9 + 552 + 6 + 6 + 88 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10647763344 + 10647763344 = 103188^2 + 103188^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=103188.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 2472213 + ... + 2480811.

Almost surely, 2^21295526688 is an apocalyptic number.

It is an amenable number.

21295526688 is an abundant number, since it is smaller than the sum of its proper divisors (39270670731).

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

21295526688 is an frugal number, since it uses more digits than its factorization.

21295526688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17214 (or 8604 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 21295526688 in words is "twenty-one billion, two hundred ninety-five million, five hundred twenty-six thousand, six hundred eighty-eight".