21044650 has 48 divisors (see below), whose sum is σ = 43309728. Its totient is φ = 7544000.

The previous prime is 21044627. The next prime is 21044687. The reversal of 21044650 is 5644012.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 23 ways as a sum of consecutive naturals, for example, 45420 + ... + 45880.

It is an arithmetic number, because the mean of its divisors is an integer number (902286).

Almost surely, 2^21044650 is an apocalyptic number.

21044650 is an abundant number, since it is smaller than the sum of its proper divisors (22265078).

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

21044650 is a wasteful number, since it uses less digits than its factorization.

21044650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21044650 is about 4587.4448225565. Note that the first 3 decimals coincide. The cubic root of 21044650 is about 276.0878124982.

Adding to 21044650 its reverse (5644012), we get a palindrome (26688662).

The spelling of 21044650 in words is "twenty-one million, forty-four thousand, six hundred fifty".