21838851846 has 96 divisors (see below), whose sum is σ = 55271424000. Its totient is φ = 6229424880.

The previous prime is 21838851823. The next prime is 21838851847. The reversal of 21838851846 is 64815883812.

21838851846 is a `hidden beast` number, since 2 + 1 + 8 + 3 + 88 + 518 + 46 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21838851792 and 21838851801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21838851847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4263675 + ... + 4268793.

It is an arithmetic number, because the mean of its divisors is an integer number (575744000).

Almost surely, 2^21838851846 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21838851846, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27635712000).

21838851846 is an abundant number, since it is smaller than the sum of its proper divisors (33432572154).

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

21838851846 is a wasteful number, since it uses less digits than its factorization.

21838851846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5839 (or 5822 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The spelling of 21838851846 in words is "twenty-one billion, eight hundred thirty-eight million, eight hundred fifty-one thousand, eight hundred forty-six".