21103003013 has 4 divisors (see below), whose sum is σ = 21105601440. Its totient is φ = 21100404588.

The previous prime is 21103003001. The next prime is 21103003039. The reversal of 21103003013 is 31030030112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21103003013 - 2¹⁰ = 21103001989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103003043) 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 in 3 ways as a sum of consecutive naturals, for example, 1286993 + ... + 1303286.

It is an arithmetic number, because the mean of its divisors is an integer number (5276400360).

Almost surely, 2^21103003013 is an apocalyptic number.

It is an amenable number.

21103003013 is a deficient number, since it is larger than the sum of its proper divisors (2598427).

21103003013 is an equidigital number, since it uses as much as digits as its factorization.

21103003013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598426.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21103003013 its reverse (31030030112), we get a palindrome (52133033125).

The spelling of 21103003013 in words is "twenty-one billion, one hundred three million, three thousand, thirteen".