21525530502 has 64 divisors (see below), whose sum is σ = 51817075200. Its totient is φ = 5823498240.

The previous prime is 21525530497. The next prime is 21525530603. The reversal of 21525530502 is 20503552512.

It is a self number, because there is not a number n which added to its sum of digits gives 21525530502.

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 31 ways as a sum of consecutive naturals, for example, 1894374 + ... + 1905702.

It is an arithmetic number, because the mean of its divisors is an integer number (809641800).

Almost surely, 2^21525530502 is an apocalyptic number.

21525530502 is an abundant number, since it is smaller than the sum of its proper divisors (30291544698).

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

21525530502 is a wasteful number, since it uses less digits than its factorization.

21525530502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13741.

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 21525530502 in words is "twenty-one billion, five hundred twenty-five million, five hundred thirty thousand, five hundred two".