21113430303 has 16 divisors (see below), whose sum is σ = 32175944960. Its totient is φ = 12063655296.

The previous prime is 21113430271. The next prime is 21113430319. The reversal of 21113430303 is 30303431112.

It is not a de Polignac number, because 21113430303 - 2⁵ = 21113430271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113430303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113430323) 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 15 ways as a sum of consecutive naturals, for example, 205863 + ... + 290871.

It is an arithmetic number, because the mean of its divisors is an integer number (2010996560).

Almost surely, 2^21113430303 is an apocalyptic number.

21113430303 is a deficient number, since it is larger than the sum of its proper divisors (11062514657).

21113430303 is a wasteful number, since it uses less digits than its factorization.

21113430303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96846.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21113430303 its reverse (30303431112), we get a palindrome (51416861415).

The spelling of 21113430303 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty thousand, three hundred three".