21285694 has 8 divisors (see below), whose sum is σ = 31960800. Its totient is φ = 10632096.

The previous prime is 21285679. The next prime is 21285703. The reversal of 21285694 is 49658212.

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 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, 2619 + ... + 7030.

It is an arithmetic number, because the mean of its divisors is an integer number (3995100).

Almost surely, 2^21285694 is an apocalyptic number.

21285694 is a deficient number, since it is larger than the sum of its proper divisors (10675106).

21285694 is a wasteful number, since it uses less digits than its factorization.

21285694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10754.

The product of its digits is 34560, while the sum is 37.

The square root of 21285694 is about 4613.6421621101. The cubic root of 21285694 is about 277.1379104482.

The spelling of 21285694 in words is "twenty-one million, two hundred eighty-five thousand, six hundred ninety-four".