21835818368 has 128 divisors (see below), whose sum is σ = 56689657920. Its totient is φ = 8130134016.

The previous prime is 21835818359. The next prime is 21835818371. The reversal of 21835818368 is 86381853812.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142880 + ... + 253152.

Almost surely, 2^21835818368 is an apocalyptic number.

21835818368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21835818368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28344828960).

21835818368 is an abundant number, since it is smaller than the sum of its proper divisors (34853839552).

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

21835818368 is a wasteful number, since it uses less digits than its factorization.

21835818368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110324 (or 110312 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 53.

The spelling of 21835818368 in words is "twenty-one billion, eight hundred thirty-five million, eight hundred eighteen thousand, three hundred sixty-eight".