21789714 has 24 divisors (see below), whose sum is σ = 45042480. Its totient is φ = 7027080.

The previous prime is 21789709. The next prime is 21789727. The reversal of 21789714 is 41798712.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3877 + ... + 7655.

It is an arithmetic number, because the mean of its divisors is an integer number (1876770).

Almost surely, 2^21789714 is an apocalyptic number.

21789714 is an abundant number, since it is smaller than the sum of its proper divisors (23252766).

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

21789714 is a wasteful number, since it uses less digits than its factorization.

21789714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846 (or 3815 counting only the distinct ones).

The product of its digits is 28224, while the sum is 39.

The square root of 21789714 is about 4667.9453724310. The cubic root of 21789714 is about 279.3083011702.

The spelling of 21789714 in words is "twenty-one million, seven hundred eighty-nine thousand, seven hundred fourteen".