21609934 has 8 divisors (see below), whose sum is σ = 32718168. Its totient is φ = 10703880.

The previous prime is 21609923. The next prime is 21609937. The reversal of 21609934 is 43990612.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21609934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21609937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50277 + ... + 50704.

It is an arithmetic number, because the mean of its divisors is an integer number (4089771).

Almost surely, 2^21609934 is an apocalyptic number.

21609934 is a deficient number, since it is larger than the sum of its proper divisors (11108234).

21609934 is a wasteful number, since it uses less digits than its factorization.

21609934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101090.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 21609934 is about 4648.6486208360. The cubic root of 21609934 is about 278.5380174951.

The spelling of 21609934 in words is "twenty-one million, six hundred nine thousand, nine hundred thirty-four".