21034434 has 16 divisors (see below), whose sum is σ = 42117120. Its totient is φ = 7003440.

The previous prime is 21034421. The next prime is 21034471. The reversal of 21034434 is 43443012.

It is a self number, because there is not a number n which added to its sum of digits gives 21034434.

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, 6304 + ... + 9044.

It is an arithmetic number, because the mean of its divisors is an integer number (2632320).

Almost surely, 2^21034434 is an apocalyptic number.

21034434 is an abundant number, since it is smaller than the sum of its proper divisors (21082686).

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

21034434 is a wasteful number, since it uses less digits than its factorization.

21034434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025.

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

The square root of 21034434 is about 4586.3312135082. The cubic root of 21034434 is about 276.0431302058.

Adding to 21034434 its reverse (43443012), we get a palindrome (64477446).

The spelling of 21034434 in words is "twenty-one million, thirty-four thousand, four hundred thirty-four".