21033004 has 24 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 9824640.

The previous prime is 21032993. The next prime is 21033007. The reversal of 21033004 is 40033012.

It is not an unprimeable number, because it can be changed into a prime (21033007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 672 + ... + 6520.

It is an arithmetic number, because the mean of its divisors is an integer number (1638000).

Almost surely, 2^21033004 is an apocalyptic number.

It is an amenable number.

21033004 is a deficient number, since it is larger than the sum of its proper divisors (18278996).

21033004 is a wasteful number, since it uses less digits than its factorization.

21033004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5913 (or 5911 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21033004 is about 4586.1753128288. The cubic root of 21033004 is about 276.0368745803.

Adding to 21033004 its reverse (40033012), we get a palindrome (61066016).

The spelling of 21033004 in words is "twenty-one million, thirty-three thousand, four".