21220324203 has 16 divisors (see below), whose sum is σ = 31213387296. Its totient is φ = 12740156160.

The previous prime is 21220324189. The next prime is 21220324241. The reversal of 21220324203 is 30242302212.

It is not a de Polignac number, because 21220324203 - 2²² = 21216129899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220324203.

It is not an unprimeable number, because it can be changed into a prime (21220324283) by changing a digit.

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, 6633900 + ... + 6637097.

It is an arithmetic number, because the mean of its divisors is an integer number (1950836706).

Almost surely, 2^21220324203 is an apocalyptic number.

21220324203 is a deficient number, since it is larger than the sum of its proper divisors (9993063093).

21220324203 is a wasteful number, since it uses less digits than its factorization.

21220324203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13271054.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21220324203 its reverse (30242302212), we get a palindrome (51462626415).

The spelling of 21220324203 in words is "twenty-one billion, two hundred twenty million, three hundred twenty-four thousand, two hundred three".