21859112 has 32 divisors (see below), whose sum is σ = 45230400. Its totient is φ = 9820800.

The previous prime is 21859111. The next prime is 21859121. The reversal of 21859112 is 21195812.

It is not an unprimeable number, because it can be changed into a prime (21859111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6437 + ... + 9227.

It is an arithmetic number, because the mean of its divisors is an integer number (1413450).

Almost surely, 2^21859112 is an apocalyptic number.

21859112 is a gapful number since it is divisible by the number (22) 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 21859112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22615200).

21859112 is an abundant number, since it is smaller than the sum of its proper divisors (23371288).

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

21859112 is a wasteful number, since it uses less digits than its factorization.

21859112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897 (or 2893 counting only the distinct ones).

The product of its digits is 1440, while the sum is 29.

The square root of 21859112 is about 4675.3729263022. The cubic root of 21859112 is about 279.6045096738.

The spelling of 21859112 in words is "twenty-one million, eight hundred fifty-nine thousand, one hundred twelve".