21303006 has 32 divisors (see below), whose sum is σ = 45746208. Its totient is φ = 6589440.

The previous prime is 21302993. The next prime is 21303011. The reversal of 21303006 is 60030312.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 6016 + ... + 8876.

It is an arithmetic number, because the mean of its divisors is an integer number (1429569).

Almost surely, 2^21303006 is an apocalyptic number.

21303006 is an abundant number, since it is smaller than the sum of its proper divisors (24443202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21303006 is a wasteful number, since it uses less digits than its factorization.

21303006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21303006 is about 4615.5179557662. The cubic root of 21303006 is about 277.2130236734.

Adding to 21303006 its reverse (60030312), we get a palindrome (81333318).

The spelling of 21303006 in words is "twenty-one million, three hundred three thousand, six".