21044234 has 16 divisors (see below), whose sum is σ = 32489856. Its totient is φ = 10216800.

The previous prime is 21044213. The next prime is 21044237. The reversal of 21044234 is 43244012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21044237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21749 + ... + 22695.

It is an arithmetic number, because the mean of its divisors is an integer number (2030616).

Almost surely, 2^21044234 is an apocalyptic number.

21044234 is a deficient number, since it is larger than the sum of its proper divisors (11445622).

21044234 is a wasteful number, since it uses less digits than its factorization.

21044234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 21044234 is about 4587.3994811876. The cubic root of 21044234 is about 276.0859932981.

Adding to 21044234 its reverse (43244012), we get a palindrome (64288246).

It can be divided in two parts, 210 and 44234, that added together give a palindrome (44444).

The spelling of 21044234 in words is "twenty-one million, forty-four thousand, two hundred thirty-four".