21046204 has 12 divisors (see below), whose sum is σ = 38997504. Its totient is φ = 9904064.

The previous prime is 21046171. The next prime is 21046217. The reversal of 21046204 is 40264012.

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 3 ways as a sum of consecutive naturals, for example, 154684 + ... + 154819.

It is an arithmetic number, because the mean of its divisors is an integer number (3249792).

Almost surely, 2^21046204 is an apocalyptic number.

It is an amenable number.

21046204 is a deficient number, since it is larger than the sum of its proper divisors (17951300).

21046204 is a wasteful number, since it uses less digits than its factorization.

21046204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309524 (or 309522 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21046204 is about 4587.6141947640. The cubic root of 21046204 is about 276.0946080480.

The spelling of 21046204 in words is "twenty-one million, forty-six thousand, two hundred four".