21220312203 has 40 divisors (see below), whose sum is σ = 35330731920. Its totient is φ = 12613916160.

The previous prime is 21220312189. The next prime is 21220312229. The reversal of 21220312203 is 30221302212.

It is not a de Polignac number, because 21220312203 - 2⁵ = 21220312171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220312903) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 379378 + ... + 431703.

It is an arithmetic number, because the mean of its divisors is an integer number (883268298).

Almost surely, 2^21220312203 is an apocalyptic number.

21220312203 is a deficient number, since it is larger than the sum of its proper divisors (14110419717).

21220312203 is a wasteful number, since it uses less digits than its factorization.

21220312203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811129 (or 811120 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21220312203 its reverse (30221302212), we get a palindrome (51441614415).

Subtracting 21220312203 from its reverse (30221302212), we obtain a palindrome (9000990009).

The spelling of 21220312203 in words is "twenty-one billion, two hundred twenty million, three hundred twelve thousand, two hundred three".