21895902500 has 30 divisors (see below), whose sum is σ = 47881965054. Its totient is φ = 8758360000.

The previous prime is 21895902407. The next prime is 21895902529. The reversal of 21895902500 is 520959812.

It can be written as a sum of positive squares in 5 ways, for example, as 15120637156 + 6775265344 = 122966^2 + 82312^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4376681 + ... + 4381680.

Almost surely, 2^21895902500 is an apocalyptic number.

21895902500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21895902500 is an abundant number, since it is smaller than the sum of its proper divisors (25986062554).

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

21895902500 is an equidigital number, since it uses as much as digits as its factorization.

21895902500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8758385 (or 8758368 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 21895902500 in words is "twenty-one billion, eight hundred ninety-five million, nine hundred two thousand, five hundred".