21718614 has 8 divisors (see below), whose sum is σ = 43437240. Its totient is φ = 7239536.

The previous prime is 21718603. The next prime is 21718637. The reversal of 21718614 is 41681712.

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

21718614 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 1809879 + ... + 1809890.

It is an arithmetic number, because the mean of its divisors is an integer number (5429655).

Almost surely, 2^21718614 is an apocalyptic number.

21718614 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21718614 is a wasteful number, since it uses less digits than its factorization.

21718614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3619774.

The product of its digits is 2688, while the sum is 30.

The square root of 21718614 is about 4660.3233793375. The cubic root of 21718614 is about 279.0041751151.

The spelling of 21718614 in words is "twenty-one million, seven hundred eighteen thousand, six hundred fourteen".