21856533465822 has 96 divisors (see below), whose sum is σ = 50877046225152. Its totient is φ = 6233294496000.

The previous prime is 21856533465803. The next prime is 21856533465829. The reversal of 21856533465822 is 22856433565812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21856533465829) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 466886797 + ... + 466933607.

It is an arithmetic number, because the mean of its divisors is an integer number (529969231512).

Almost surely, 2^{21856533465822} is an apocalyptic number.

21856533465822 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21856533465822 is an abundant number, since it is smaller than the sum of its proper divisors (29020512759330).

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

21856533465822 is a wasteful number, since it uses less digits than its factorization.

21856533465822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84686 (or 84675 counting only the distinct ones).

The product of its digits is 82944000, while the sum is 60.

The spelling of 21856533465822 in words is "twenty-one trillion, eight hundred fifty-six billion, five hundred thirty-three million, four hundred sixty-five thousand, eight hundred twenty-two".