21483868 has 48 divisors (see below), whose sum is σ = 45287424. Its totient is φ = 8723520.

The previous prime is 21483859. The next prime is 21483883. The reversal of 21483868 is 86838412.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21483868.

It is a congruent number.

It is an unprimeable number.

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, 45771 + ... + 46237.

It is an arithmetic number, because the mean of its divisors is an integer number (943488).

Almost surely, 2^21483868 is an apocalyptic number.

21483868 is a gapful number since it is divisible by the number (28) 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 21483868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22643712).

21483868 is an abundant number, since it is smaller than the sum of its proper divisors (23803556).

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

21483868 is a wasteful number, since it uses less digits than its factorization.

21483868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 560 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 21483868 is about 4635.0693630193. The cubic root of 21483868 is about 277.9953245250.

The spelling of 21483868 in words is "twenty-one million, four hundred eighty-three thousand, eight hundred sixty-eight".