21310204 has 6 divisors (see below), whose sum is σ = 37292864. Its totient is φ = 10655100.

The previous prime is 21310199. The next prime is 21310207. The reversal of 21310204 is 40201312.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2663772 + ... + 2663779.

Almost surely, 2^21310204 is an apocalyptic number.

It is an amenable number.

21310204 is a deficient number, since it is larger than the sum of its proper divisors (15982660).

21310204 is a wasteful number, since it uses less digits than its factorization.

21310204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327555 (or 5327553 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21310204 is about 4616.2976507153. The cubic root of 21310204 is about 277.2442423451.

Adding to 21310204 its reverse (40201312), we get a palindrome (61511516).

The spelling of 21310204 in words is "twenty-one million, three hundred ten thousand, two hundred four".