21847336819386 has 64 divisors (see below), whose sum is σ = 47657446502400. Its totient is φ = 6636329758656.

The previous prime is 21847336819331. The next prime is 21847336819411. The reversal of 21847336819386 is 68391863374812.

It is a super-2 number, since 2×21847336819386² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21847336819386.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49612885 + ... + 50051303.

It is an arithmetic number, because the mean of its divisors is an integer number (744647601600).

Almost surely, 2^{21847336819386} is an apocalyptic number.

21847336819386 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21847336819386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23828723251200).

21847336819386 is an abundant number, since it is smaller than the sum of its proper divisors (25810109683014).

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

21847336819386 is a wasteful number, since it uses less digits than its factorization.

21847336819386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446603.

The product of its digits is 250822656, while the sum is 69.

The spelling of 21847336819386 in words is "twenty-one trillion, eight hundred forty-seven billion, three hundred thirty-six million, eight hundred nineteen thousand, three hundred eighty-six".