21678014 has 8 divisors (see below), whose sum is σ = 32605320. Its totient is φ = 10809576.

The previous prime is 21678001. The next prime is 21678037. The reversal of 21678014 is 41087612.

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

It is a Curzon number.

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, 13784 + ... + 15275.

It is an arithmetic number, because the mean of its divisors is an integer number (4075665).

Almost surely, 2^21678014 is an apocalyptic number.

21678014 is a deficient number, since it is larger than the sum of its proper divisors (10927306).

21678014 is a wasteful number, since it uses less digits than its factorization.

21678014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29434.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 21678014 is about 4655.9654208338. The cubic root of 21678014 is about 278.8302131962.

The spelling of 21678014 in words is "twenty-one million, six hundred seventy-eight thousand, fourteen".