21324234 has 8 divisors (see below), whose sum is σ = 42648480. Its totient is φ = 7108076.

The previous prime is 21324227. The next prime is 21324253. The reversal of 21324234 is 43242312.

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

21324234 is an admirable number.

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 21324234.

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 3 ways as a sum of consecutive naturals, for example, 1777014 + ... + 1777025.

It is an arithmetic number, because the mean of its divisors is an integer number (5331060).

Almost surely, 2^21324234 is an apocalyptic number.

21324234 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21324234 is a wasteful number, since it uses less digits than its factorization.

21324234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554044.

The product of its digits is 1152, while the sum is 21.

The square root of 21324234 is about 4617.8170167299. The cubic root of 21324234 is about 277.3050720991.

Adding to 21324234 its reverse (43242312), we get a palindrome (64566546).

The spelling of 21324234 in words is "twenty-one million, three hundred twenty-four thousand, two hundred thirty-four".