21843995768 has 96 divisors (see below), whose sum is σ = 49096808640. Its totient is φ = 9078048000.

The previous prime is 21843995741. The next prime is 21843995819. The reversal of 21843995768 is 86759934812.

It is a super-2 number, since 2×21843995768² (a number of 21 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 21843995768.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4595393 + ... + 4600143.

It is an arithmetic number, because the mean of its divisors is an integer number (511425090).

Almost surely, 2^21843995768 is an apocalyptic number.

21843995768 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 21843995768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24548404320).

21843995768 is an abundant number, since it is smaller than the sum of its proper divisors (27252812872).

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

21843995768 is a wasteful number, since it uses less digits than its factorization.

21843995768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125 (or 5114 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 62.

The spelling of 21843995768 in words is "twenty-one billion, eight hundred forty-three million, nine hundred ninety-five thousand, seven hundred sixty-eight".