21101223203 has 4 divisors (see below), whose sum is σ = 21591949368. Its totient is φ = 20610497040.

The previous prime is 21101223197. The next prime is 21101223323. The reversal of 21101223203 is 30232210112.

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 21101223203 - 2¹⁸ = 21100961059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101222203) 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, 245363018 + ... + 245363103.

It is an arithmetic number, because the mean of its divisors is an integer number (5397987342).

Almost surely, 2^21101223203 is an apocalyptic number.

21101223203 is a deficient number, since it is larger than the sum of its proper divisors (490726165).

21101223203 is an equidigital number, since it uses as much as digits as its factorization.

21101223203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490726164.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21101223203 its reverse (30232210112), we get a palindrome (51333433315).

The spelling of 21101223203 in words is "twenty-one billion, one hundred one million, two hundred twenty-three thousand, two hundred three".