21211313203 has 4 divisors (see below), whose sum is σ = 21291964848. Its totient is φ = 21130661560.

The previous prime is 21211313177. The next prime is 21211313209. The reversal of 21211313203 is 30231311212.

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 21211313203 - 2⁵ = 21211313171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211313209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40325428 + ... + 40325953.

It is an arithmetic number, because the mean of its divisors is an integer number (5322991212).

Almost surely, 2^21211313203 is an apocalyptic number.

21211313203 is a deficient number, since it is larger than the sum of its proper divisors (80651645).

21211313203 is an equidigital number, since it uses as much as digits as its factorization.

21211313203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80651644.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21211313203 its reverse (30231311212), we get a palindrome (51442624415).

The spelling of 21211313203 in words is "twenty-one billion, two hundred eleven million, three hundred thirteen thousand, two hundred three".