21854845812 has 48 divisors (see below), whose sum is σ = 51683615424. Its totient is φ = 7187040000.

The previous prime is 21854845811. The next prime is 21854845813.

21854845812 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (21854845811) and next prime (21854845813).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21854845811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308487 + ... + 372657.

It is an arithmetic number, because the mean of its divisors is an integer number (1076741988).

Almost surely, 2^21854845812 is an apocalyptic number.

It is an amenable number.

21854845812 is an abundant number, since it is smaller than the sum of its proper divisors (29828769612).

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

21854845812 is a wasteful number, since it uses less digits than its factorization.

21854845812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64560 (or 64558 counting only the distinct ones).

The product of its digits is 819200, while the sum is 48.

The spelling of 21854845812 in words is "twenty-one billion, eight hundred fifty-four million, eight hundred forty-five thousand, eight hundred twelve".