21044002 has 32 divisors (see below), whose sum is σ = 37296000. Its totient is φ = 8719488.

The previous prime is 21043999. The next prime is 21044003. The reversal of 21044002 is 20044012.

It is not an unprimeable number, because it can be changed into a prime (21044003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60124 + ... + 60472.

It is an arithmetic number, because the mean of its divisors is an integer number (1165500).

Almost surely, 2^21044002 is an apocalyptic number.

21044002 is a deficient number, since it is larger than the sum of its proper divisors (16251998).

21044002 is a wasteful number, since it uses less digits than its factorization.

21044002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 21044002 is about 4587.3741944603. The cubic root of 21044002 is about 276.0849787338.

Adding to 21044002 its reverse (20044012), we get a palindrome (41088014).

The spelling of 21044002 in words is "twenty-one million, forty-four thousand, two".