21668883404 has 48 divisors (see below), whose sum is σ = 45060079680. Its totient is φ = 8920853760.

The previous prime is 21668883367. The next prime is 21668883419. The reversal of 21668883404 is 40438886612.

It is a happy number.

It is a super-2 number, since 2×21668883404² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92234 + ... + 227694.

It is an arithmetic number, because the mean of its divisors is an integer number (938751660).

Almost surely, 2^21668883404 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 21668883404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22530039840).

21668883404 is an abundant number, since it is smaller than the sum of its proper divisors (23391196276).

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

21668883404 is a wasteful number, since it uses less digits than its factorization.

21668883404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135698 (or 135696 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 50.

The spelling of 21668883404 in words is "twenty-one billion, six hundred sixty-eight million, eight hundred eighty-three thousand, four hundred four".