21236034 has 32 divisors (see below), whose sum is σ = 45144000. Its totient is φ = 6640704.

The previous prime is 21236021. The next prime is 21236041. The reversal of 21236034 is 43063212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21236034.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11572 + ... + 13280.

It is an arithmetic number, because the mean of its divisors is an integer number (1410750).

Almost surely, 2^21236034 is an apocalyptic number.

21236034 is an abundant number, since it is smaller than the sum of its proper divisors (23907966).

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

21236034 is a wasteful number, since it uses less digits than its factorization.

21236034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 21236034 is about 4608.2571542830. The cubic root of 21236034 is about 276.9222196436.

Adding to 21236034 its reverse (43063212), we get a palindrome (64299246).

The spelling of 21236034 in words is "twenty-one million, two hundred thirty-six thousand, thirty-four".