21040104203 has 4 divisors (see below), whose sum is σ = 21040613568. Its totient is φ = 21039594840.

The previous prime is 21040104191. The next prime is 21040104223. The reversal of 21040104203 is 30240104012.

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 21040104203 - 2⁴ = 21040104187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21040104223) 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, 186668 + ... + 277353.

It is an arithmetic number, because the mean of its divisors is an integer number (5260153392).

Almost surely, 2^21040104203 is an apocalyptic number.

21040104203 is a deficient number, since it is larger than the sum of its proper divisors (509365).

21040104203 is an equidigital number, since it uses as much as digits as its factorization.

21040104203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509364.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21040104203 its reverse (30240104012), we get a palindrome (51280208215).

The spelling of 21040104203 in words is "twenty-one billion, forty million, one hundred four thousand, two hundred three".