21222003203 has 4 divisors (see below), whose sum is σ = 22338950760. Its totient is φ = 20105055648.

The previous prime is 21222003169. The next prime is 21222003211. The reversal of 21222003203 is 30230022212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222003203 - 2¹² = 21221999107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222002203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558473750 + ... + 558473787.

It is an arithmetic number, because the mean of its divisors is an integer number (5584737690).

Almost surely, 2^21222003203 is an apocalyptic number.

21222003203 is a deficient number, since it is larger than the sum of its proper divisors (1116947557).

21222003203 is a wasteful number, since it uses less digits than its factorization.

21222003203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116947556.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21222003203 its reverse (30230022212), we get a palindrome (51452025415).

The spelling of 21222003203 in words is "twenty-one billion, two hundred twenty-two million, three thousand, two hundred three".