21033030013 has 4 divisors (see below), whose sum is σ = 21758306940. Its totient is φ = 20307753088.

The previous prime is 21033029987. The next prime is 21033030049. The reversal of 21033030013 is 31003033012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8353594404 + 12679435609 = 91398^2 + 112603^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033030013 - 2⁵ = 21033029981 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 (21033030313) 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 in 3 ways as a sum of consecutive naturals, for example, 362638420 + ... + 362638477.

It is an arithmetic number, because the mean of its divisors is an integer number (5439576735).

Almost surely, 2^21033030013 is an apocalyptic number.

It is an amenable number.

21033030013 is a deficient number, since it is larger than the sum of its proper divisors (725276927).

21033030013 is an equidigital number, since it uses as much as digits as its factorization.

21033030013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725276926.

The product of its (nonzero) digits is 162, while the sum is 16.

Adding to 21033030013 its reverse (31003033012), we get a palindrome (52036063025).

The spelling of 21033030013 in words is "twenty-one billion, thirty-three million, thirty thousand, thirteen".