21043044 has 48 divisors (see below), whose sum is σ = 59519040. Its totient is φ = 6376320.

The previous prime is 21043037. The next prime is 21043069. The reversal of 21043044 is 44034012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7669 + ... + 10044.

It is an arithmetic number, because the mean of its divisors is an integer number (1239980).

Almost surely, 2^21043044 is an apocalyptic number.

It is an amenable number.

21043044 is an abundant number, since it is smaller than the sum of its proper divisors (38475996).

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

21043044 is a wasteful number, since it uses less digits than its factorization.

21043044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17737 (or 17729 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 21043044 is about 4587.2697762395. The cubic root of 21043044 is about 276.0807892040.

Adding to 21043044 its reverse (44034012), we get a palindrome (65077056).

The spelling of 21043044 in words is "twenty-one million, forty-three thousand, forty-four".