21103320013 has 4 divisors (see below), whose sum is σ = 21111084160. Its totient is φ = 21095555868.

The previous prime is 21103319983. The next prime is 21103320053. The reversal of 21103320013 is 31002330112.

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 21103320013 - 2¹³ = 21103311821 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 (21103320053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3877995 + ... + 3883432.

It is an arithmetic number, because the mean of its divisors is an integer number (5277771040).

Almost surely, 2^21103320013 is an apocalyptic number.

It is an amenable number.

21103320013 is a deficient number, since it is larger than the sum of its proper divisors (7764147).

21103320013 is an equidigital number, since it uses as much as digits as its factorization.

21103320013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7764146.

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

Adding to 21103320013 its reverse (31002330112), we get a palindrome (52105650125).

The spelling of 21103320013 in words is "twenty-one billion, one hundred three million, three hundred twenty thousand, thirteen".