21847857792 has 64 divisors (see below), whose sum is σ = 58061223360. Its totient is φ = 7279124480.

The previous prime is 21847857781. The next prime is 21847857799. The reversal of 21847857792 is 29775874812.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (21847857799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860317 + ... + 885347.

It is an arithmetic number, because the mean of its divisors is an integer number (907206615).

Almost surely, 2^21847857792 is an apocalyptic number.

It is an amenable number.

21847857792 is an abundant number, since it is smaller than the sum of its proper divisors (36213365568).

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

21847857792 is a wasteful number, since it uses less digits than its factorization.

21847857792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27321 (or 27309 counting only the distinct ones).

The product of its digits is 15805440, while the sum is 60.

The spelling of 21847857792 in words is "twenty-one billion, eight hundred forty-seven million, eight hundred fifty-seven thousand, seven hundred ninety-two".