21003220306 has 32 divisors (see below), whose sum is σ = 32568915456. Its totient is φ = 10151856000.

The previous prime is 21003220297. The next prime is 21003220319. The reversal of 21003220306 is 60302230012.

It is a super-2 number, since 2×21003220306² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10644336 + ... + 10646308.

It is an arithmetic number, because the mean of its divisors is an integer number (1017778608).

Almost surely, 2^21003220306 is an apocalyptic number.

21003220306 is a deficient number, since it is larger than the sum of its proper divisors (11565695150).

21003220306 is a wasteful number, since it uses less digits than its factorization.

21003220306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3138.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21003220306 its reverse (60302230012), we get a palindrome (81305450318).

The spelling of 21003220306 in words is "twenty-one billion, three million, two hundred twenty thousand, three hundred six".