21525317560 has 32 divisors (see below), whose sum is σ = 49462436160. Its totient is φ = 8426932096.

The previous prime is 21525317557. The next prime is 21525317603. The reversal of 21525317560 is 6571352512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5722939 + ... + 5726698.

It is an arithmetic number, because the mean of its divisors is an integer number (1545701130).

Almost surely, 2^21525317560 is an apocalyptic number.

21525317560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525317560 is an abundant number, since it is smaller than the sum of its proper divisors (27937118600).

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

21525317560 is a wasteful number, since it uses less digits than its factorization.

21525317560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11449695 (or 11449691 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 37.

The spelling of 21525317560 in words is "twenty-one billion, five hundred twenty-five million, three hundred seventeen thousand, five hundred sixty".