21093635 has 8 divisors (see below), whose sum is σ = 25408080. Its totient is φ = 16811104.

The previous prime is 21093613. The next prime is 21093661. The reversal of 21093635 is 53639012.

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 21093635 - 2¹⁰ = 21092611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21093598 and 21093607.

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 7 ways as a sum of consecutive naturals, for example, 6497 + ... + 9186.

It is an arithmetic number, because the mean of its divisors is an integer number (3176010).

Almost surely, 2^21093635 is an apocalyptic number.

21093635 is a deficient number, since it is larger than the sum of its proper divisors (4314445).

21093635 is a wasteful number, since it uses less digits than its factorization.

21093635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15957.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 21093635 is about 4592.7807480872. The cubic root of 21093635 is about 276.3018602773.

The spelling of 21093635 in words is "twenty-one million, ninety-three thousand, six hundred thirty-five".