21033321013 has 4 divisors (see below), whose sum is σ = 21034304928. Its totient is φ = 21032337100.

The previous prime is 21033321007. The next prime is 21033321047. The reversal of 21033321013 is 31012333012.

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 21033321013 - 2⁵ = 21033320981 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 (21033301013) 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, 459163 + ... + 502888.

It is an arithmetic number, because the mean of its divisors is an integer number (5258576232).

Almost surely, 2^21033321013 is an apocalyptic number.

It is an amenable number.

21033321013 is a deficient number, since it is larger than the sum of its proper divisors (983915).

21033321013 is an equidigital number, since it uses as much as digits as its factorization.

21033321013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983914.

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

Adding to 21033321013 its reverse (31012333012), we get a palindrome (52045654025).

The spelling of 21033321013 in words is "twenty-one billion, thirty-three million, three hundred twenty-one thousand, thirteen".