21839768042868 has 48 divisors (see below), whose sum is σ = 56641836424320. Its totient is φ = 7277323536000.

The previous prime is 21839768042867. The next prime is 21839768042909. The reversal of 21839768042868 is 86824086793812.

21839768042868 is a `hidden beast` number, since 2 + 1 + 83 + 9 + 7 + 68 + 0 + 428 + 68 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21839768042796 and 21839768042805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21839768042867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35795328 + ... + 36400343.

It is an arithmetic number, because the mean of its divisors is an integer number (1180038258840).

Almost surely, 2^{21839768042868} is an apocalyptic number.

It is an amenable number.

21839768042868 is an abundant number, since it is smaller than the sum of its proper divisors (34802068381452).

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

21839768042868 is a wasteful number, since it uses less digits than its factorization.

21839768042868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72198485 (or 72198477 counting only the distinct ones).

The product of its (nonzero) digits is 445906944, while the sum is 72.

The spelling of 21839768042868 in words is "twenty-one trillion, eight hundred thirty-nine billion, seven hundred sixty-eight million, forty-two thousand, eight hundred sixty-eight".