21066935 has 8 divisors (see below), whose sum is σ = 25436400. Its totient is φ = 16749504.

The previous prime is 21066931. The next prime is 21066937. The reversal of 21066935 is 53966012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21066935 - 2² = 21066931 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066931) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 12110 + ... + 13739.

It is an arithmetic number, because the mean of its divisors is an integer number (3179550).

Almost surely, 2^21066935 is an apocalyptic number.

21066935 is a deficient number, since it is larger than the sum of its proper divisors (4369465).

21066935 is a wasteful number, since it uses less digits than its factorization.

21066935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26017.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 21066935 is about 4589.8730919275. The cubic root of 21066935 is about 276.1852315006.

The spelling of 21066935 in words is "twenty-one million, sixty-six thousand, nine hundred thirty-five".