21384854 has 8 divisors (see below), whose sum is σ = 33112128. Its totient is φ = 10347480.

The previous prime is 21384841. The next prime is 21384877. The reversal of 21384854 is 45848312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172397 + ... + 172520.

It is an arithmetic number, because the mean of its divisors is an integer number (4139016).

Almost surely, 2^21384854 is an apocalyptic number.

21384854 is a deficient number, since it is larger than the sum of its proper divisors (11727274).

21384854 is a wasteful number, since it uses less digits than its factorization.

21384854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344950.

The product of its digits is 30720, while the sum is 35.

The square root of 21384854 is about 4624.3760660223. The cubic root of 21384854 is about 277.5675954695.

The spelling of 21384854 in words is "twenty-one million, three hundred eighty-four thousand, eight hundred fifty-four".