21041204 has 12 divisors (see below), whose sum is σ = 36854244. Its totient is φ = 10511424.

The previous prime is 21041203. The next prime is 21041213. The reversal of 21041204 is 40214012.

It can be written as a sum of positive squares in 2 ways, for example, as 16418704 + 4622500 = 4052^2 + 2150^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7664 + ... + 10040.

It is an arithmetic number, because the mean of its divisors is an integer number (3071187).

Almost surely, 2^21041204 is an apocalyptic number.

It is an amenable number.

21041204 is a deficient number, since it is larger than the sum of its proper divisors (15813040).

21041204 is a wasteful number, since it uses less digits than its factorization.

21041204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4594 (or 4592 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21041204 is about 4587.0692168312. The cubic root of 21041204 is about 276.0727421512.

Adding to 21041204 its reverse (40214012), we get a palindrome (61255216).

It can be divided in two parts, 210 and 41204, that added together give a palindrome (41414).

The spelling of 21041204 in words is "twenty-one million, forty-one thousand, two hundred four".