21221330203 has 4 divisors (see below), whose sum is σ = 21953100240. Its totient is φ = 20489560168.

The previous prime is 21221330189. The next prime is 21221330219. The reversal of 21221330203 is 30203312212.

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 21221330203 - 2¹³ = 21221322011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221330293) 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 3 ways as a sum of consecutive naturals, for example, 365884975 + ... + 365885032.

It is an arithmetic number, because the mean of its divisors is an integer number (5488275060).

Almost surely, 2^21221330203 is an apocalyptic number.

21221330203 is a deficient number, since it is larger than the sum of its proper divisors (731770037).

21221330203 is an equidigital number, since it uses as much as digits as its factorization.

21221330203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731770036.

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

Adding to 21221330203 its reverse (30203312212), we get a palindrome (51424642415).

The spelling of 21221330203 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirty thousand, two hundred three".