21318854 has 8 divisors (see below), whose sum is σ = 32308248. Its totient is φ = 10549440.

The previous prime is 21318839. The next prime is 21318859. The reversal of 21318854 is 45881312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21318854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21318859) 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 3 ways as a sum of consecutive naturals, for example, 54752 + ... + 55139.

It is an arithmetic number, because the mean of its divisors is an integer number (4038531).

Almost surely, 2^21318854 is an apocalyptic number.

21318854 is a deficient number, since it is larger than the sum of its proper divisors (10989394).

21318854 is a wasteful number, since it uses less digits than its factorization.

21318854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109990.

The product of its digits is 7680, while the sum is 32.

The square root of 21318854 is about 4617.2344536530. The cubic root of 21318854 is about 277.2817492329.

The spelling of 21318854 in words is "twenty-one million, three hundred eighteen thousand, eight hundred fifty-four".