21843955746 has 56 divisors (see below), whose sum is σ = 49155410304. Its totient is φ = 7277023800.

The previous prime is 21843955717. The next prime is 21843955747. The reversal of 21843955746 is 64755934812.

It is a happy number.

21843955746 is a `hidden beast` number, since 2 + 1 + 8 + 43 + 9 + 557 + 46 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 21843955692 and 21843955701.

It is not an unprimeable number, because it can be changed into a prime (21843955747) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3331171 + ... + 3337721.

It is an arithmetic number, because the mean of its divisors is an integer number (877775184).

Almost surely, 2^21843955746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21843955746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24577705152).

21843955746 is an abundant number, since it is smaller than the sum of its proper divisors (27311454558).

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

21843955746 is an equidigital number, since it uses as much as digits as its factorization.

21843955746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8858 (or 8843 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 21843955746 in words is "twenty-one billion, eight hundred forty-three million, nine hundred fifty-five thousand, seven hundred forty-six".