21020111303 has 2 divisors, whose sum is σ = 21020111304. Its totient is φ = 21020111302.

The previous prime is 21020111221. The next prime is 21020111351. The reversal of 21020111303 is 30311102012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020111303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020114303) 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, 10510055651 + 10510055652.

It is an arithmetic number, because the mean of its divisors is an integer number (10510055652).

Almost surely, 2^21020111303 is an apocalyptic number.

21020111303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020111303 is an equidigital number, since it uses as much as digits as its factorization.

21020111303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21020111303 its reverse (30311102012), we get a palindrome (51331213315).

The spelling of 21020111303 in words is "twenty-one billion, twenty million, one hundred eleven thousand, three hundred three".