21044046 has 16 divisors (see below), whose sum is σ = 43226064. Its totient is φ = 6825024.

The previous prime is 21044003. The next prime is 21044047. The reversal of 21044046 is 64044012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47175 + ... + 47618.

It is an arithmetic number, because the mean of its divisors is an integer number (2701629).

Almost surely, 2^21044046 is an apocalyptic number.

21044046 is an abundant number, since it is smaller than the sum of its proper divisors (22182018).

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

21044046 is a wasteful number, since it uses less digits than its factorization.

21044046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94835.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 21044046 is about 4587.3789902296. The cubic root of 21044046 is about 276.0851711517.

Adding to 21044046 its reverse (64044012), we get a palindrome (85088058).

The spelling of 21044046 in words is "twenty-one million, forty-four thousand, forty-six".