21830797500 has 120 divisors (see below), whose sum is σ = 63977020800. Its totient is φ = 5791896000.

The previous prime is 21830797493. The next prime is 21830797529. The reversal of 21830797500 is 579703812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1485187 + ... + 1499813.

It is an arithmetic number, because the mean of its divisors is an integer number (533141840).

Almost surely, 2^21830797500 is an apocalyptic number.

21830797500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21830797500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31988510400).

21830797500 is an abundant number, since it is smaller than the sum of its proper divisors (42146223300).

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

21830797500 is a wasteful number, since it uses less digits than its factorization.

21830797500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14853 (or 14836 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 21830797500 in words is "twenty-one billion, eight hundred thirty million, seven hundred ninety-seven thousand, five hundred".