21221113203 has 6 divisors (see below), whose sum is σ = 30652719084. Its totient is φ = 14147408796.

The previous prime is 21221113189. The next prime is 21221113241. The reversal of 21221113203 is 30231112212.

It is not a de Polignac number, because 21221113203 - 2⁸ = 21221112947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221113253) 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 5 ways as a sum of consecutive naturals, for example, 1178950725 + ... + 1178950742.

It is an arithmetic number, because the mean of its divisors is an integer number (5108786514).

Almost surely, 2^21221113203 is an apocalyptic number.

21221113203 is a deficient number, since it is larger than the sum of its proper divisors (9431605881).

21221113203 is a wasteful number, since it uses less digits than its factorization.

21221113203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357901473 (or 2357901470 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21221113203 its reverse (30231112212), we get a palindrome (51452225415).

Subtracting 21221113203 from its reverse (30231112212), we obtain a palindrome (9009999009).

The spelling of 21221113203 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirteen thousand, two hundred three".