21830197856 has 48 divisors (see below), whose sum is σ = 44209389168. Its totient is φ = 10606732800.

The previous prime is 21830197843. The next prime is 21830197871. The reversal of 21830197856 is 65879103812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94646 + ... + 229386.

It is an arithmetic number, because the mean of its divisors is an integer number (921028941).

Almost surely, 2^21830197856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21830197856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22104694584).

21830197856 is an abundant number, since it is smaller than the sum of its proper divisors (22379191312).

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

21830197856 is a wasteful number, since it uses less digits than its factorization.

21830197856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134895 (or 134887 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 21830197856 in words is "twenty-one billion, eight hundred thirty million, one hundred ninety-seven thousand, eight hundred fifty-six".