21004113203 has 2 divisors, whose sum is σ = 21004113204. Its totient is φ = 21004113202.

The previous prime is 21004113167. The next prime is 21004113239. The reversal of 21004113203 is 30231140012.

It is a balanced prime because it is at equal distance from previous prime (21004113167) and next prime (21004113239).

It is a cyclic number.

It is not a de Polignac number, because 21004113203 - 2²⁰ = 21003064627 is a prime.

It is not a weakly prime, because it can be changed into another prime (21004113253) 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 as a sum of consecutive naturals, namely, 10502056601 + 10502056602.

It is an arithmetic number, because the mean of its divisors is an integer number (10502056602).

Almost surely, 2^21004113203 is an apocalyptic number.

21004113203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004113203 is an equidigital number, since it uses as much as digits as its factorization.

21004113203 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21004113203 its reverse (30231140012), we get a palindrome (51235253215).

The spelling of 21004113203 in words is "twenty-one billion, four million, one hundred thirteen thousand, two hundred three".