21033312103 has 6 divisors (see below), whose sum is σ = 21302933064. Its totient is φ = 20767061484.

The previous prime is 21033312089. The next prime is 21033312163. The reversal of 21033312103 is 30121333012.

It is not a de Polignac number, because 21033312103 - 2⁵ = 21033312071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033312163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1678851 + ... + 1691332.

It is an arithmetic number, because the mean of its divisors is an integer number (3550488844).

Almost surely, 2^21033312103 is an apocalyptic number.

21033312103 is a deficient number, since it is larger than the sum of its proper divisors (269620961).

21033312103 is an frugal number, since it uses more digits than its factorization.

21033312103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3370341 (or 3370262 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21033312103 its reverse (30121333012), we get a palindrome (51154645115).

The spelling of 21033312103 in words is "twenty-one billion, thirty-three million, three hundred twelve thousand, one hundred three".