21382868 has 48 divisors (see below), whose sum is σ = 42119616. Its totient is φ = 9434880.

The previous prime is 21382861. The next prime is 21382871. The reversal of 21382868 is 86828312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382861) 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 15 ways as a sum of consecutive naturals, for example, 163163 + ... + 163293.

It is an arithmetic number, because the mean of its divisors is an integer number (877492).

Almost surely, 2^21382868 is an apocalyptic number.

It is an amenable number.

21382868 is a deficient number, since it is larger than the sum of its proper divisors (20736748).

21382868 is a wasteful number, since it uses less digits than its factorization.

21382868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 262 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 21382868 is about 4624.1613293656. The cubic root of 21382868 is about 277.5590026853.

The spelling of 21382868 in words is "twenty-one million, three hundred eighty-two thousand, eight hundred sixty-eight".