21044463 has 8 divisors (see below), whose sum is σ = 30610176. Its totient is φ = 12754200.

The previous prime is 21044431. The next prime is 21044467. The reversal of 21044463 is 36444012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21044463 - 2⁵ = 21044431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318823 + ... + 318888.

It is an arithmetic number, because the mean of its divisors is an integer number (3826272).

Almost surely, 2^21044463 is an apocalyptic number.

21044463 is a deficient number, since it is larger than the sum of its proper divisors (9565713).

21044463 is a wasteful number, since it uses less digits than its factorization.

21044463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637725.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 21044463 is about 4587.4244407946. The cubic root of 21044463 is about 276.0869947357.

Adding to 21044463 its reverse (36444012), we get a palindrome (57488475).

The spelling of 21044463 in words is "twenty-one million, forty-four thousand, four hundred sixty-three".