21044361 has 16 divisors (see below), whose sum is σ = 30356480. Its totient is φ = 12890880.

The previous prime is 21044347. The next prime is 21044369. The reversal of 21044361 is 16344012.

It is not a de Polignac number, because 21044361 - 2¹⁷ = 20913289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21044369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8280 + ... + 10518.

It is an arithmetic number, because the mean of its divisors is an integer number (1897280).

Almost surely, 2^21044361 is an apocalyptic number.

It is an amenable number.

21044361 is a deficient number, since it is larger than the sum of its proper divisors (9312119).

21044361 is a wasteful number, since it uses less digits than its factorization.

21044361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21044361 is about 4587.4133234318. The cubic root of 21044361 is about 276.0865486814.

Adding to 21044361 its reverse (16344012), we get a palindrome (37388373).

The spelling of 21044361 in words is "twenty-one million, forty-four thousand, three hundred sixty-one".