21659234 has 8 divisors (see below), whose sum is σ = 33281388. Its totient is φ = 10565440.

The previous prime is 21659219. The next prime is 21659243. The reversal of 21659234 is 43295612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19333609 + 2325625 = 4397^2 + 1525^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21659234.

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, 131987 + ... + 132150.

Almost surely, 2^21659234 is an apocalyptic number.

21659234 is a deficient number, since it is larger than the sum of its proper divisors (11622154).

21659234 is a wasteful number, since it uses less digits than its factorization.

21659234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264180.

The product of its digits is 12960, while the sum is 32.

The square root of 21659234 is about 4653.9482162998. The cubic root of 21659234 is about 278.7496716198.

The spelling of 21659234 in words is "twenty-one million, six hundred fifty-nine thousand, two hundred thirty-four".