21234044 has 12 divisors (see below), whose sum is σ = 40018104. Its totient is φ = 9800304.

The previous prime is 21234029. The next prime is 21234049. The reversal of 21234044 is 44043212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204122 + ... + 204225.

It is an arithmetic number, because the mean of its divisors is an integer number (3334842).

Almost surely, 2^21234044 is an apocalyptic number.

It is an amenable number.

21234044 is a deficient number, since it is larger than the sum of its proper divisors (18784060).

21234044 is a wasteful number, since it uses less digits than its factorization.

21234044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408364 (or 408362 counting only the distinct ones).

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

The square root of 21234044 is about 4608.0412324544. The cubic root of 21234044 is about 276.9135693713.

Adding to 21234044 its reverse (44043212), we get a palindrome (65277256).

The spelling of 21234044 in words is "twenty-one million, two hundred thirty-four thousand, forty-four".