21854112 has 96 divisors (see below), whose sum is σ = 69455232. Its totient is φ = 5873664.

The previous prime is 21854111. The next prime is 21854153. The reversal of 21854112 is 21145812.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21854112² = 955204422617088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21854111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10468 + ... + 12380.

It is an arithmetic number, because the mean of its divisors is an integer number (723492).

Almost surely, 2^21854112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21854112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34727616).

21854112 is an abundant number, since it is smaller than the sum of its proper divisors (47601120).

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

21854112 is a wasteful number, since it uses less digits than its factorization.

21854112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950 (or 1942 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

The square root of 21854112 is about 4674.8381790175. The cubic root of 21854112 is about 279.5831893634.

Adding to 21854112 its reverse (21145812), we get a palindrome (42999924).

The spelling of 21854112 in words is "twenty-one million, eight hundred fifty-four thousand, one hundred twelve".