21847439113794 has 128 divisors (see below), whose sum is σ = 58754032888320. Its totient is φ = 5874479935488.

The previous prime is 21847439113793. The next prime is 21847439113873. The reversal of 21847439113794 is 49731193474812.

It is a happy number.

21847439113794 is a `hidden beast` number, since 2 + 1 + 8 + 474 + 3 + 91 + 1 + 3 + 79 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (21847439113793) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85962234 + ... + 86216010.

It is an arithmetic number, because the mean of its divisors is an integer number (459015881940).

Almost surely, 2^{21847439113794} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21847439113794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29377016444160).

21847439113794 is an abundant number, since it is smaller than the sum of its proper divisors (36906593774526).

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

21847439113794 is a wasteful number, since it uses less digits than its factorization.

21847439113794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267209 (or 267203 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 21847439113794 in words is "twenty-one trillion, eight hundred forty-seven billion, four hundred thirty-nine million, one hundred thirteen thousand, seven hundred ninety-four".