21013436303 has 2 divisors, whose sum is σ = 21013436304. Its totient is φ = 21013436302.

The previous prime is 21013436291. The next prime is 21013436309. The reversal of 21013436303 is 30363431012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21013436303 - 2²⁶ = 20946327439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013436309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506718151 + 10506718152.

It is an arithmetic number, because the mean of its divisors is an integer number (10506718152).

Almost surely, 2^21013436303 is an apocalyptic number.

21013436303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013436303 is an equidigital number, since it uses as much as digits as its factorization.

21013436303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21013436303 its reverse (30363431012), we get a palindrome (51376867315).

The spelling of 21013436303 in words is "twenty-one billion, thirteen million, four hundred thirty-six thousand, three hundred three".