21044630 has 32 divisors (see below), whose sum is σ = 39204000. Its totient is φ = 8128512.

The previous prime is 21044627. The next prime is 21044687. The reversal of 21044630 is 3644012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 46646 + ... + 47094.

It is an arithmetic number, because the mean of its divisors is an integer number (1225125).

Almost surely, 2^21044630 is an apocalyptic number.

21044630 is a deficient number, since it is larger than the sum of its proper divisors (18159370).

21044630 is a wasteful number, since it uses less digits than its factorization.

21044630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21044630 is about 4587.4426426932. The cubic root of 21044630 is about 276.0877250372.

Adding to 21044630 its reverse (3644012), we get a palindrome (24688642).

The spelling of 21044630 in words is "twenty-one million, forty-four thousand, six hundred thirty".