21211030303 has 2 divisors, whose sum is σ = 21211030304. Its totient is φ = 21211030302.

The previous prime is 21211030297. The next prime is 21211030327. The reversal of 21211030303 is 30303011212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211030303 is a prime.

21211030303 is a modest number, since divided by 30303 gives 21211 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211030003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605515151 + 10605515152.

It is an arithmetic number, because the mean of its divisors is an integer number (10605515152).

Almost surely, 2^21211030303 is an apocalyptic number.

21211030303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211030303 is an equidigital number, since it uses as much as digits as its factorization.

21211030303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21211030303 its reverse (30303011212), we get a palindrome (51514041515).

The spelling of 21211030303 in words is "twenty-one billion, two hundred eleven million, thirty thousand, three hundred three".