21112040203 has 4 divisors (see below), whose sum is σ = 21329690200. Its totient is φ = 20894390208.

The previous prime is 21112040167. The next prime is 21112040219. The reversal of 21112040203 is 30204021112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112040203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112040603) 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, 108824853 + ... + 108825046.

It is an arithmetic number, because the mean of its divisors is an integer number (5332422550).

Almost surely, 2^21112040203 is an apocalyptic number.

21112040203 is a deficient number, since it is larger than the sum of its proper divisors (217649997).

21112040203 is an equidigital number, since it uses as much as digits as its factorization.

21112040203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217649996.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21112040203 its reverse (30204021112), we get a palindrome (51316061315).

The spelling of 21112040203 in words is "twenty-one billion, one hundred twelve million, forty thousand, two hundred three".